[Help] System crashes without BSOD

[ffgiza]

Have you checked your hard drive yet? Changed SATA cables?
Do you have a spare power supply also?

I doubt it's the hard drive, because I have a new one and I had this issue with old one too.

No, I don't have a spare PSU around, I will try this procedure asap.

I was going to buy a new graphics card and monitor this month. Maybe I should get a new mobo and ram instead of the monitor?

[mikeo01]

Same SATA cable though?
I wouldn't replace the motherboard and RAM, because that's expensive.

You tested your RAM, CPU and video card haven't you? So that kinda rules them out.

How old is your power supply?

[ffgiza]

How old is your power supply?

my psu is 3 years old just as my mobo and ram.

I ran sisoft sandra's burn-in test today, just in case. And when the test got to the memory part my system became very unstable and the sound froze, just like it does before it crashes. If it really is the memory, I don't want to buy new DDRII because that doesn't make any sense because DDRIII is cheaper at higher capacity, so I see that the mobo+ram replacement as a reasonable option.

[mikeo01]

Have you tested with only 1 of each RAM sticks in? I'd let memtest86+ run again a few times to double check them.

But:
1 - It's hard to say for definite, but you've stress tested all areas which means your processor, RAM and graphics card are stable. But you've also mentioned your last hard drive had issues in this system also.
2 - You've also had BSODs which pointed to drivers, however when testing in both power saving and also just general gaming the issues appeared.
3 - A new system was your computer just showed a blank screen when booting up, just means a POST failure or not enough power is being supplied to the components.

Just to be a pain, but have you got a different CPU power plug on your PSU? Make sure everything is secure. Check the voltages in the BIOS, although not accurate may give an idea. Because you've checked everything in both high stress and low stress situations it probably does point to the motherboard or power supply. The PSU may be the culprit.

Have you checked sleep and hibernation yet? These states require low power so wondering if the PSU is up to the task.

The reason why is there doesn't really seem to be a pattern when the issue occurs.


Also just to note about the replacement, if you do go down this route it is wise to go for DDR3, not just because of its higher performance but it's cheaper for you in the long run. That said I wouldn't bother replacing your system yet unless you really want an upgrade as it's a costly path based on assumptions. However you want to double check it's not the power supply otherwise it may effect your new system