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Computer keep crashing when **starting** 3D applications / games

Last response: in Graphics & Displays
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January 14, 2012 8:38:18 AM

Hello,
I've noticed this serious problem days ago when I was playing Star Trek Online. When playing, I switched out of the game to check IRC msgs. When I switched back, I only saw the game interface less than a second then my system crashes (no sound, monitor reports "No Signal" and numlock key failed too). I have to reset my computer. And within a day I can't even see STO's interface; the computer crash instantly after loading screens. Then when I try to use 3D window switch of Windows 7, same thing happens sometimes. I then tried other 3D games like TrackMania, and I could only see the rotating globe (3D) for a fraction of second then my computer crashed again. It seems that any 3D rendering would crash my system.

The strange thing is I could run some other applications which use GPU at 100% but with no 3D renders, like miners of cryptocurrency.

I'm not overclocking my system.
Checked CPU and GPU's temperature and both are fine.
Tried minimal system, no luck.
Tried many drivers from 275.33 to 290.xx beta, no luck. I was using 285 driver without any problems.

System spec:
CPU: AMD Phenom II X4 940
Memory: Kingston 3 x 1GB
MB: Gigabyte MA78GM-US2H
GPU: Galaxy GeForce GTS250

Any help is appreciated, it's driving me crazy these days.
a c 175 U Graphics card
January 14, 2012 9:00:41 AM

You said using 285 drivers was fine, why don't you stay with it. Remember that Beta version are not the real version, so they sometimes has some bugs.
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January 14, 2012 9:10:38 AM

Well I didn't make myself clear.
I'm using 285 driver now, still have the problem.

I used 275.33 too, and didn't have this problem at that time.
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January 24, 2012 12:50:52 AM

Changed a PSU and problem solved. Looks like my PSU is too old and can't provide sufficient power.
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!