It used to be rather erratic and happen only once every couple of days, then I would sometimes have stretches as long as a week or more without any crashes but recently I've been having them systematically at EVERY startup!
I start my computer, it will usually boot up into Windows 10 Pro 64bit and then I rarely have to wait more than a few minutes for it to freeze or suddenly restart (more rarely a BSOD). Then starts a cycle of a few more restarts and freezes - always happening almost instantly or after a few minutes - before it eventually stabilizes and can then run reliably for the rest of the day!?
This is why I've ruled out temperature problems as it would seem the reverse would happen, i.e. crashing AFTER sufficient time was given to the system to heat up.
I have run 2 passes of MemTest without any errors but I've heard that as many as 10 might be needed to reliably exclude RAM problems but seeing how slow it runs the test on my 12Gb of memory, I couldn't be without my PC for that long!?
Other useful troubleshooting info: I've recently upgraded to Win 10 in hope of solving my problems - it was already happening under Win 7. It's a 2nd PC I bought off ebay some +- 2 years ago so I don't know how old exactly it is but you'll see the specs in the attached files I guess.
Some of the BSOD errors I collected are (from oldest to most recent):
- Clock Watchdog Timeout
- Machine Check Exception
- PA (dxgkrnl.sys)
- Kernel Security Check Failure
There were others before that but I'm afraid I didn't jot those down.
I should mention also that I've had freezes happen at what looks like to me, pre-OS loading stage. At boot-up, during those BIOS POST messages appearing. I thought that was quite worrying as to me, it would indicate that it most probably is hardware-related because at this stage, the OS is not involved, right? It's less frequent but has happened.
What I find strange though, is that, as I explained above, after a few crashes and freezes, it will work fine for a whole day!? This is why I find this problem very confusing and strange?! On one hand it sound like it would really likely be a hardware problem (because of the crash during BIOS POST), then on the other hand, the fact that several reboots seem to flush the problems away, makes me think it's maybe software related?!
Thanks in advance for any help you can provide!