Crash, Crash, Crash?!?!??!

Hello fellow Gurus,

So, I bought my Rig 6 months ago, roughly, and eversince, I've had a problem.
Basically, my computer crashes and the only way to bring it back to life is to hard reset.
This crash locks everything, even scroll lock stops working. It is also followed by sound loop like a robot Heres a small video.
It can happen during gaming or idleing on desktop but it surely happens more often during COD4MW2 gaming.
I've tried every single setting on Bios, OC, no OC, more Volts, less Volts, more Ram speed, less Ram speed etc.
I've tested Kombustor+Prime95 simultaneously and nothing wrong happens but I dunno if its just luck of the draw or simply something else.

My question is, what do you think it is? Which diagnostic tools should I run? All the hardware is under warranty so I can return it for RMA if I can prove something is wrong so thats not a problem. I don't have a PSU to test the system on, nor a motherboard or other GPU/CPU for that matter since I've given everything away.

I recently switched HD's but the problem existed eversince I bought the rig with my old HD so the problem isn't there aswell. I'm getting desperate because I simply cannot game without having to hard reset the PC once or twice a day which is annoying.

Also, theres no events on event viewer nor BSOD's, just plain crash+sound loop.

 

Hard locks are often caused by faulty memory or CPU.

deltatux

 

Only option you have is to start replacing stuff, you could start with GPU if you e.g. have an on board graphics chip. If you can't replace them then just start RMAing them piece by piece.
Since you have no crash logs or anything (and you've tried OC, UC and all other settings) I can't come up with anything else to do other than replace hardware to eventually find out what is causing the problem.
Do whatever you can, remove sound card, use on board etc. try to borrow hardware that works 100% from your friends or something.
That noise sounds creepy :s

Edit: have you tried every RAM slot on your motherboard, and did you try running with only 1 stick?

 

I still say the hard lock and repeating sound is from faulty memory or CPU because that's happened to me before.

deltatux

 

Try a overnight memory test

 

Just did a 15min test on the 1st Ram stick and it passed.
Gonna try and play MW2 and see if it hangs and take it from there.
Seeing as the tests take too long and I can't really sleep with my PC on I'll probably leave it tomorrow during the whole day.

Another thing, I need to do the tests separately right? Or test both sticks together?

 

Do it a stick at a time.

deltatux

 

Just as a starting point....running memtest with all modules installed can shorten testing time. If the system passes with all modules installed, they're fine. If it fails, start testing individually.

 

~1h of COD4MW2 gaming and no signs of problems.

So its either luck of draw, 2nd ram stick screwed up or the second ram slot screwed up.

Gonna test ram stick 2 on the slot (1) and two (2).
But I have to remove the bloody CPU HSF

 

Ram stick 2 passed aswell?
I don't get this, perhaps its not the Ram?

 

Try testing the Sapphire HD 6850 through a burn test, usually I run Furmark for a good hour or so. If it locks up or fails, then your GPU is dead.

deltatux

 

Both sticks passed together.
Gonna assume its not a Ram problem.

If my GPU is dead, would it cause this sort of crash?
I have an old GF8600GT I can test while playing to see if the problem happens.

 

Yes, it could cause this, especially if overclocked.

deltatux

 

Got Prime95 Blend running together with Furmark on stability test with extreme burn mode.

Lets see what happens.

I noticed my 12V dropped to 11.38 on HWMonitor not sure how accurate it is but its worrying if it indeed dropped to that value.

CPU is at stock, Ram at 1333Mhz and GPU is at 940/1130 at 1.212V since its the settings I use to play. Also I have to say the problem happens whether I have OC's in place or not.

 

Don't run more than one stress testing tool, it may cause problems.

deltatux

 

The system is surprisingly fast.
Doesn't really feel like I'm running Prime Blend and Furmark.
12V dropped to 11.32V, I believe I gotta get a multimeter to test these voltages out.

 

Are all the cores running at 100%?

Please don't run both Prime and Furmark. You can't load your GPU completely when the CPU is completely loaded.

deltatux

 

Yes.
And Trixx stated otherwise, GPU load at 100% with a max temp of 70C.

 

Testing only Furmark now.
Also is it normal that Furmark uses 1 Core at 100% while doing burn in test?

 

Furmark iirc isn't multithreaded.

deltatux