help with finding issue

[jonny512379]

PC runs fine most the time.

Symptoms are :
Both screens go black (but the monitors do not enter standby),
The PC appears to stay on,
Fans continuing to run at normal speed (not over heating).
All sound goes off too (sound and graphics are on different hardware, not via HDMI),
Keyboard does not seem to respond (Ctrl + Alt + Del does nothing),
So seems to be a full system crash,
The restart button seems to part work, in that when it is pressed the monitors go into stand by, but the PC does not restart.
Only the main (front panel) power switch shuts down the PC.

Once restarted all works OK again.
This happens on average once a day but seems to be random.
This has happened on and off for a few months.

hardware is all of good quality (from OCuk)
PSU = 600 watt Corsair (CX600 i think)
GPU = r9 290 (saphire) (no OC)
i5 2500K (small OC @ 4.4)

I have ran an extended ram test and all is OK
(all ram is Corsair @ no OC)

The problem seems to happen when gaming (but it is my sons PC and getting sense from him is half the problem...)

I am wondering if if is the PSU?

Any ideas welcome

 

[jonny512379]

thanks guys n girls

good to have conformation before i buy a new PSU.....

any suggestions on a good PSU that the r9 290 will be comfortable with?

 

[jonny512379]

@sastusbulbas

thanks for such a detailed reply. I will set my lad off doing some stress testing tomorrow and hopefully this will narrow things down a little.
I do have an antec 620 (and another antec but i forget what the power of this is) so if it looks like the PSU after testing i can always swap it out for one of these.

thanks again for the advice, possibly saved me some pennies!