Windows 10: PC crashing randomly (No BSOD)

Hi,

So my PC have been crashing many times a day lately.
When this crash happens my screens just go black and sound disappears, but pc still runs. (Fans keeps spinning) and I have to turn pc off from PSU.
And again crashes are random. It happens while I'm gaming, browising web, youtube etc.
Sometimes I can go hours without crashes and sometimes multiple crashes in a hour.

Things I have done/noticed:

-Re-installed Windows
-Updated all drivers and bios
-Tried to run with only one stick of RAM
-Run memtest with 0 errors
-No overclocks
-No errors in Event viewer except Kerner power which is probably because I have to cut the power from PSU.
-No overheating (atleast not CPU or GPU)
-Nothing have been changed in my setup
-Replugged every component and checked for visible damage.
-System is 2 years old

I'm pretty experienced with computers but now I don't have any idea what is going on.

Thanks in advance!

:)

 

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Hello I wanted to know if anyone can help me stop my pc from getting the BSOD. It randomly occurs while booting up of after being in use. The minidump says it was caused by svchost.exe. (I did a fresh install of windows but it didn't fix the problem) any
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PC reboots (no BSOD) on CPU stress

Hi fellow TPU members,

not too long ago, the box my gf's PC was transported in gave way on the stairs. Yes, you got it right, that sent a PC tumbling down a flight of steps alright.

Stuff broke. Also, stuff remained intact somehow.

I bought her a new case, new CPU cooler and we removed the floppy drive, so far so good. But the PC started crashing for no apparent reason, without a BSOD.

I tested:

• Memtest86+, left overnight, 0 errors
• Scanned the HDD for errors, nothing there
• Left FurMark burning up the GFX card and drawing some power, no problems there
• Ran Ubuntu from a Live CD doing nothing special, didn't crash
• Ran OCCT, Linpack, Prime95, all 3 caused reboots within minutes
• Oh, and I disabled "Restart on error" so I'm sure it's not a BSOD.

Now, I can still try and test something CPU intensive on Ubuntu, but my guess is the CPU didn't survive.
Before I do anything drastic like whippin' out the magic wallet and get her a new AMD quad, is there anything I didn't see?
I'm guessing the motherboard could be borkered as well, but can I check that other than replacing the CPU with a working one?
Any suggestions on which proggies I can use from an Ubuntu Live CD to stress the CPU?