i have spent the last 30mins reading everyones replies.. and also many hours trying to solve this problem..
amd 2200+ 133fsb
asus 7n266vm m/b
512 266ddr ram
gainward gf4 ti4200 64mb ram
driver den. v.53
Windows xp pro
direct x 9
i too hav the same problems as you. 2d seems to work fine, however when running a 3d game/benchmark it will crash/hang/ even coloured lines will appear on the screen. the only thing you can do is reset my pc. If i do reset my pc, the coloured lines still appear in at the bios stage. this means i need to turn off the pc for good, then turn it on again. then everything works ok, until you run i my 3d game again.
I hav found that to improve the stabilty of games, try running games at a higher resolution i.e 1024*768 or higher in 32bit colour - this seems to crash less. with quality settings on i.e FSA*2
it is not an over heating issue, as the card not not feel hot when it crashes. cpu avg temp 39c, motherboard temp 28c. and yes the fan is spilling well in my gf4 card. and doesnt crash in windows at all.
it seems to be a problem with direct 3d. Try switching your games to run in OpenGL mode. i tried it last night and UT ran for 3 hours without a single crash. If i run UT in direct3d mode, it will crash within 5mins - coloured lines/system hang. most games run in direct3d. so if possible switch to another mode. if u change to your game to run in software mode, i am pretty sure your card will not crash.
i will try switching back to directx8.1 later today. perhaps this may help. as gf4 ti4200 was designed for directx8.1.
I dont think it has anything to do with voltages - all my monitors say it is running well at 3.3v, 1.7 v core, and 12.9V. Windows xp 2d seems to be find.
i will try the power management settings in my bios later to se if this makes any difference.(i.e turning off all power saving settings in bios/windows).
But my biggest tip change to opengl mode ! ! (seems stable)
Heard v30 drivers are better, so i downgraded - did not work for me.
Spent months on this problem. will give up and buy a new card at the weekend!