Could it be my RAM?

If you got several sticks why not try one by one?

At this point it could be ram, could be your motherboard, could be your gpu, could be drivers.

First check your drivers than move on to hardware because in my case it was nvidia driver which was causing the blue screen crash. I simply reinstalled it and now its working fine for like 3 months zero crashes.

Run the Event Viewer and check for errors. And do a check on your hard drive.

I would suggest performing a check for corrupt files first.

Copy & paste this into ur command prompt, then press enter:
DISM.exe /Online /Cleanup-image /Restorehealth

And that's done, do the same for this:
sfc /scannow

https://support.microsoft.com/en-us/topic/use-the-system-file-checker-tool-to-repair-missing-or-corrupted-system-files-79aa86cb-ca52-166a-92a3-966e85d4094e

I´m the kind of guy who fixed everyones computers since the 90s and if there is one thing I´ve learned: It can ALWAYS be the RAM 😅

But as many people already said, there are a lot of other possibilities. Its always best to find a way to borrow compatible hardware so you can swap one thing out after the other and see if the problem gets fixed at some point (sadly very time consuming, when the problem occours randomly).

I´ve also encountered all kinds of strange behavior caused by defective USB Devices & Ports, so it might be worth reducing the amount of connected USB-Devices to the absolute minimum for a while and connect them to ports that are not in use ATM and see if it helps.

Could be overheating CPU/GPU. System will then boot after it cools a bit. (I had this issue with my laptop, dust in the air intake)

My money is on your PSU(power supply). Seriously though according to your description it could be anything and everything. Best method would be to disassemble the box and carefully inspect every component for faulty capacitors, ICs and so on. After inspection if you didn't find anything obviously wrong next step would be replacing one component after another with a known good component. But for this you'd need a working computer as parts donor.
For testing RAM use only one memory bank at a time and test each stick individually in different memory slots.

Edit: You might need a multimeter for testing. Check some vids from NorthridgeFix and/or Louis Rossmann on how error analysis is done.

Might be the RAM, yes. I'd similar issue. My PC was crashing quite randomly, most often on playing videos in the browser, but also few minutes after starting any game. Usually, it then worked fine until the next day. I've suspected audio driver/motherboard issue at first. But after some time it stopped booting at all. I've checked the RAM, removed one of the sticks and the original issue went away.

Not the first suspect but do you have Intel i5 CPU by any chance? There is a known issue with Intel bay trail that cause random freezes on some i5 variants.

If it's because of RAM you must run memtest86 to be sure. However if you have large amount of RAM, this test might take days to complete one cycle, it's kind of a pain.

RAM seems to be the culprit here,so get another one.Still,I'd advise you to get Hard Disk Sentinel and Check your HDD/SSD life/health.My PC was superslow and crashed a lot, I got an SSD and now,everything is fine.

I'd recommend running memtest86 for ~16-24 hours, or until an error occurs. If the error are in the same spot all the time then it's your RAM, if it's a random placing of errors then there's a good chance it's the Mobo. If it comes back clean it could be your GPU, but it could also be a faulty drive or your PSU. That said it's typically motherboard, GPU, RAM or CPU in that order. Unless the crashes are consistently occuring under load, then the PSU becomes a prime suspect too.

I didn't read all the answers so it has probably been suggested already. But just in case : you have a simple way to verify your RAM, by running Memtest (link fixed; thanks to Kappaking)
All you need is an USB stick and a bit of time. Then launch the test and let it run for a few hours, it will give you a clear vision on how your RAM goes.

Without reading any comments, here's some options you can try

1. Check your GPU and GPU drivers
   Had a friend which had a issue like this with a new RTX 3060TI card, in his case it was the driver, downgraded 2 versions and it worked fine. You can also attempt to remove your GPU and run your computer off the IGPU if your CPU has one (you can just search up your CPUs info and it'll show you on AMDs/Intels website).
2. Check you RAM
   Run something like memtest86 and wait for it to finish (it can be a looong wait if you have a lot of memory). You can also insert your RAM in different sockets or try to reseat it, or remove 1 stick and leave only 1 if you have a dual-channel kit.
3. Fixes that don't fit in a specific category
   For this section I'll list 2 possible solutions:
   • Try to boot off another OS, you can easily make a Linux USB drive with something like BalenaEtcher or Rufus, and personally I'd go for Pop_OS! due to them having preinstalled NVIDIA drivers (yes, I know that other distros have them too, but this one is the only one that comes to mind which also has both proprietery NVIDIA drivers and the open-sourced ones) and leaving it to run. Just remember that your performance may be a bit sluggish due to it running off a USB drive.
   • Check event logs in Windows, can sometimes provide some clues, like why it crashed and such. You may have some IDs and such that you can search up and usually get a answer from Lord Google himself.

Hope this "might help".

Without details about your hardware setup, your processor, your ram type, size, and speed, your motherboard, your graphics card, the programs you run, your operating system, your background programs, and the kinds of things you do on your PC, the best you're going to get is people throwing spaghetti at the walls.

Programs like like HWINFO (CPUZ, and GPUZ could also give some useful detail) as well as exact error codes and descriptions will go a long way toward providing context for these errors. You can also use a program like BlueScreenView by Nirsoft to look back at some of your bluescreens (if they were logged, they may not always be) and report some of those error codes from the relevant dates, or take pictures of your screen the next time you have a bluescreen and post them on imgur so that someone can look up the errors.

Without those details its impossible to know if you're running into heat problems, hard to tell if your ram is running at the right speeds or voltages (Something important bios settings can change after losing power, being unplugged, or being powered down too long in some cases with a bad CMOS battery.) Could be issues caused by a bad PSU that is extremely old, overloaded, or from a non-reputable company. Details from your event viewer logs and what errors are showing up in there could also potentially help. S.M.A.R.T. readout from your your harddrive could help determine some issues as well.

With only one stick of ram you wont be able to swap and test the other stick to see if theres any more stability. Ram that seems to throw errors in memtest could indicate an issue with ram thats going bad, or it could simply be that the ram and or processor are misconfigured in the bios, and or the ram could just be in the wrong slot which has been known to cause issues on some motherboards. (Though typically it'll result in a no-boot rather than weird errors, but cant really rule that out.) Your bios may have settings on what to do after a power loss, and windows should have settings on what to do after a bluescreen, whether its autoreboot or not.

What are the exact bluescreen errors and codes you get?
What are your PC hardware specs?
What operating system / what version?
When did you get your PC?
When was the last time the PC was running fine?
What hardware have you changed, updated, or fiddled with since it was running fine?
What programs did you newly start using or updating?
Is your bios up to date / does it support the CPU you put in it?
What do your temps look like at idle, and under load?
Do you have a non-microsoft virusscanner that could be causing some issue?
Have you tried booting in safe mode and messing around for a few hours, does the problem happen there?
Do you have stable power in the house / dont have too many things plugged into one circuit (room / nearby rooms.)
Does your PC run for days without crashing, or is it measured in minutes / hours?
Have you monitored the programs running in the background with something like Process Explorer and eliminated the non-necessary ones from your startup to see if that helps improve stability?
Are you trying to use any software to overclock anything, either intentionally or unintentionally?
Do you have your ram in the right slot on the motherboard? (Most motherboards have a preference for which slots are populated first.)
Are your ram voltages correct for the ram type?
Did you enable XMP or DOCP which are technically overclocks on the ram?
Do you live in a very hot, humid, or dusty environment? (Taking a picture of the inside of your PC could help give people an idea of if there are any weird problems going on there.)
Does your PC crash when its just sitting idle and you're not doing anything with it?
Do you have enough ram + Virtual memory to run the programs you're trying to run? (Browsers left open too long can have memory leaks, as can some games.)
Imgur has been known to bluescreen some computers if you scroll endlessly or have too many video tabs open at once.
Some failing mice, keyboards, and network cards have been known to cause bluescreens. (Some can also be caused by driver problems.)

The more detail you can provide, the fewer shots in the dark that people will take and the more you can focus your efforts, but it does require a couple of hours of gathering screenshots and details and posting them in a way that would let people help a bit more easily. It could also just be the case that some random piece of your hardware is in the process of failing, or is simply incompatible, but its hard to know for sure.

EDIT: It might not hurt to visually check for leaky capacitors on the motherboard too. Have seen that create problems in the mid to late 2000's, have also seen power supplies with leaky main capacitors. However you should not open a PSU if you dont know what you're doing.

I would say try to check your disk health, I had one with problems and it did similiar stuff to what you said, I use CrystalDiskInfo.

how old are your RAMs?
maybe their are just with dust in the gold contacts.
I use a pencil eraser (the white one) to clean the gold contacts and after that they shine as new.
if the rams are new, did you check compatibility with your mother?

A friend had the same problem and it was a PSU issue, but it can be any other thing, just keep it in mind

I did quick google search and this is what popped up. Maybe give it a shot and see what happens. I didn't read the whole tread and don't know if it has been suggested all ready.

Is there a RAM tester?
Windows has a built-in RAM testing tool. It's included on Windows 10, Windows 11, Windows 7, and all other modern versions of Windows. To launch the Windows Memory Diagnostic tool, open the Start menu, type “Windows Memory Diagnostic”, and press Enter.

since nobody mentioned it and because of your mentioned RAM I'm guessing your pc has come to a certain age:
check your cpu, gpu, mainboard and HDD/SSD temperatures
e.g. Open Hardware Monitor or CPUID Monitor

Anyone suggested to test GPU memory (VRAM) specifically?

Did you completely clean it? And took things out and set them back in properly? One of the PC's here had problems, it had sudden power downs. Not starting up the first time, only the second time etc. In the end it was a graphics card that got a bit loose. Once all was properly set again it all worked perfectly once again. So that would be my step 1 advice :)

I haven't read through all the other comments, but the first thing I would do is check the Windows event log and see if there is anything there that can give you a hint.

Also, what type of buzzing is it and where do you hear it. Does it come through speakers or is it a buzzing like a coil whine or electrical arcing that you can hear if you put your ear near the case or possibly monitor. On my last computer, I had a bad case power button that would randomly turn the computer on in the middle of the night, so I always flipped the main power switch on the back of the PSU every night to make sure it stayed off. I eventually wore out something in the switch and it started to make an electrical arcing noise. The PSU was old enough that I was already considering replacing it, so I didn't bother trying to fix it.

Also, I have had my GPU drivers crash and the computer would keep running, but the GPU would get stuck in an extremely low power state. Games would go from like 100 fps down to something like 5. Restarting the computer would make it run normal again. Maybe your GPU driver is crashing and then when it is running in that low power state it is causing coil whine and that is what you are hearing. There are so many possibilities.

Edit: When I originally read that the computer still runs and you can see an image on the screen, I thought the computer was still running in a state where you could use it, but after reading it again, it sounds like you meant that the image freezes on the screen and you hear buzzing in the speakers. This is hard to diagnose because I think pretty much any part of the computer failing could cause it.

I would try uninstalling and reinstalling the CPU in the socket, heatsink on the CPU, memory, GPU, and all data and power cables to make sure everything is connected properly and not loose. You can try setting the BIOS back to default settings if you did overclocking or any advanced settings from there and disable software overclocks from within windows if you are running any just to get everything back to factory settings. Then I would use a program to monitor temperatures while you run some kind of stress test on the CPU or GPU to see if the temps are reasonable and if it crashes. You can also run a memory test.

If the computer is still crashing, I would try uninstalling and reinstalling any major drivers and test again. If it still crashes, I would either try a fresh operating system install or start trying to narrow down hardware issues. Try to find a certain stress test that will always make it crash and then use that to test as you make changes. You can try underclocking the frequency of the CPU or GPU and see if it makes it stable. Try one stick of RAM at a time. It could also be the power supply failing. If you have access to parts that are compatible, you can try swapping them in one at a time. Swapping components if you have access to them would obviously be the easiest way to test, but most people will not have spare parts. There may be other ways to test for faulty components while they are in the system. Maybe try doing a search for how to test each individual component.

I don't know how long you have had windows 11 but Windows 11's Hardware Requirements Are Too Stringent!
Try installing a good copy of Windows 10 and see if that helps at all as windows 10 is more stable.
Then you can always re-upgrade later.
Hope you get it sorted mate 👍