PC acting weird, please help

[hensie]

Hi!


My PC has been doing this for almost 2 weeks, there are a few variations of what it does: Screen turns black and sound goes off while PC is still running, other one: my PC just randomly shuts down without any warning and the 3rd one screen freezes and sound goes off..

I took it to the local pc shop 3 times already, they couldn't tell what was the problem they ran tests on all the components and everything looked fine after replacing my old HDD. But then I took it home and it happened again screen went black and sound went off as well during a youtube video..

I don't know what to do it's really frustrating , I have warranty on all the components but if I can't tell what's wrong then I can't send it to the company to repair it..

PSU: Corsair CX500 V2
Motherboard: ASUS M5A87
GPU: AMD Sapphire 6870 1GB
CPU: Amd Phenom X4 955 3.4 ghz

My temperatures are fine. Any ideas?

 

[Deleted member 217926]

Sounds like bad RAM or maybe a failing power supply. Have you run memtest? 8 to 10 hours to fully check 8GB.

http://www.memtest.org/

Download the precompiled .iso file. Burn it to a CD. Then change your boot order in BIOS to the CD drive first so the computer boots off the CD. This allows the memtest program to test 100% of your RAM with none allocated for Windows.

If you don't have a burning program use imgburn. It's a great free, lightweight burning suite.

http://www.imgburn.com/

Any errors at all in memtest mean a problem. Even one.

 

[hensie]

I've done that and the guys in the PC shop have as well.
No errors at all.

It's really weird and annoying at the same time, cause I don't know whats the exact problem so I can't have it fixed..

 

[Deleted member 217926]

You ran an overnight pass of memtest ? Not just the memory tester in Windows but actual memtest?

Next thing I would try is a new power supply. I don't suppose you have an extra laying around?

Could also be a bad video card.

Are you overclocking anything? If so stop and see if there are still errors.

 

[hensie]

I ran the actual memtest from a CD for over 6 hours.

I'm not overclocking anything.

The weird part is , these freezes/shutdowns are completely random , I mean sometimes it lets me play for hours and then it shuts down when I'm just browsing the internet..

So I guess the potential components that cause the failure are PSU/MOBO/CPU/GPU ? !

Unfortunately I don't have a spare one of any of these.

I ran benchmarks too , to see if the temperatures go up but it didn't happen.