Strange PC Prob, Don't know where to start

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19 Feb 2006
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West Mids
So i'm happily going about my business, with it be gaming or surfing and the monitor goes off...
Thinking the worst I assume the GTX has died/dying but under further investigaion the PC is "hanging" and as such the montor just looses it's signal.

Upon a reboot all is fine again for 30-45 mins and it does it again, no blue screens no beeps just no signal to monitor and the PC has hanged, cant switch the numlock/capslock on/off sorta hang.

Yes thats my diagnostic for a hanged PC the numlock light cant be turned off/on :D Also I know it's hanging as I can see myself disconnect from online games from another PC.

Anways temps are fine, hovering around 50c under load. The GTX is fine 59c idle 80c loaded.
Windows is not giving me a "this system has recovered from a serious error" message after reboot.

Possibly a power issue? hard to confirm that without a bigger better PSU...
HD's have green light from there diagnostic tools.
The memory and CPU is going through Orthos fine, so a bit of a mystery to me.
Specs are
540Watt OCZ Modstream PSU
Gigabyte P35C DS3-R
E2180
2 x 1GB OCZ Platnium Ram

Anyone have any suggestions?
Im leaning towards a power issue, Maybe the 12V dips a little too much and it just knocks the GTX off. Whilst it is a 540W it does'nt have the greatest of 12V rails.
 
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