nvlddmkm and crashes

[zorack8000]

about a month ago, my computer started crashing with a blue screen after 2+ hours of playing 3d games. it has gotten more and more frequent and sometimes it crashes randomly while idle. before it bluescreens my main screen goes black and the image on the second screen gets scrambled. i am fairly sure it is a bad video card because i tried reinstalling all drivers and even reinstalled windows. none of my parts are overclocked. I have deleted, cleaned and everything to all of my drivers. It is either my video card is fried or an insufficient power supply. I dont want to jump and get a new part that i dont need, so i would like to know if there is anything i can do.

My Specs:
Windows 7 Home 64-bit
samsung 4gb ddr2-1200
corsair 550w psu
samsung 500gb 5200rpm 32mb buffer hdd
EVGA factory overclocked 1gb GTS250(i have tried underclocking)
EVGA 780i SLI mobo
intel q8200 2.33Ghz quad core
Massive titan fenrir heatsink
hauppage tv tuner
thermaltake m9 case with plenty of fans and ventilation

my minidump files are attached

 

[JMH]

zorach8000,
I note that you have sought help here on 3 other occasions recently. Refer links below.
Different people have given you good advice in good faith.

Have you followed all of the advice that was given to you?

FYI - How to find drivers you were advised to update:
- visit the web site of the manufacturer of the hardware/program to get the latest drivers (DON'T use Windows Update or the Update driver function of Device Manager).


http://www.sevenforums.com/crashes-debugging/71050-video-driver-bsod-error.html

http://www.sevenforums.com/crashes-debugging/77702-nvlddmkm-sys-crash.html

http://www.sevenforums.com/crashes-debugging/80350-nvlddmkm-crashes.html