Monitor dropping / Crashing out during games

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THE PROBLEM:

At apparently random intervals into playing some 3D games the monitor goes black. In a couple of seconds, the green light next to the power switch starts flashing (like it's in standby mode).

Occasionally a sound effect will loop 1-2 times before going silent, as if the system were hanging.

The system fans keep running, and the MoBo lights stay on.

Restarting the monitor does nothing - the light goes green, then returns to flashing mode.

Only way i can re-boot is to hold off button in for longer then 4 sec.

Note that I am not overclocking, never have overclocked, and never intend to overclock.


WHEN IT OCCURS:

Playing 3D accellerated games, at apparently random intervals. usually about 10min - 2hrs of game play

Games when it has occurred:

world of Warcraft
Diablo ii

Games when it has NOT occurred:*

*At least not during the hour or more of time I played.

Call of duty 2

It NEVER occurs during non-gaming computer use, internet use, etc.

My system:

ASUS A8N-SLI Deluxe motherboard
--SLI set to single card mode and dual card mode

AMD Athalon 64 3500+

2xNVIDIA GeForce Extreme N6600GT GPU, 256 MB DDR3, PCI express, SLI capable (not using & using)

2x 512 Mb RAM, DDRRAM Kingston

Oringaly 350W Power supply w/super lan boy case.
NOW 500W Antec Smartpower Unit

2 X 200Gb WD SATA, Running Raid 0

ASUS CD/DVD R/W

Phillips 19" LCD Monitor 8Ms

Windows XP Home Edition


WHAT I HAVE TRIED (that has not worked):


*Changed NVIDIA driver to ver. 81.85 then to newer 81.98 Beta

*Turned off all power management settings in Windows

TEMPERATURE TESTING:

*Reworked inner cables for better airflow - all round cables

*Monitored GPU temps during regular computing and 3D gameplay. Temp values do not rise outside of tolerance ranges. However, the NVIDIA monitor does not leave a log of temps behind, so I have had to alt-tab out of games at intervals to record manually the temps - meaning if there is a sudden spike I could not observe it.

3D gaming: highest recorded GPU temp 52c

I have read endless Forums about this problem. I am begining to give up, any ideas people would be fantastic. Nearly ready to replace these 6600GT's see if that rectify's the problem

Cheers
 
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