I'm having trouble with a new video card, i think. i was running a GeForce FX 5200, 128mb,  and everything was working fine. i'm getting a new LCD monitor very soon, so i upgraded to a PNP Geforce 6200 256mb ddr, (Both cards installed in the AGP slot.) because it has a DVI connection for the new monitor. Install went fine, loaded the newest Geforce drivers on-line, and everything appeared to work fine until i tried playing a video clip. the computer almost freezes, everything takes forever to work, and the monitor goes black for a few moments, comes back on, goes black, and sometimes just stays black. Usually i have to hit reset, and then everything works fine till i try to play any type of video. Any SUGGESTIONS would be greatly appreciated. I don't know whether this an incompatible card or a settings issue on my machine.

Mothreboard-eVGA nForce3 250 chipset SATA RAID AGP8X w/GbLAN, USB2
CPU-AMD Athlon64 2800+ w/HTT
RAM-1024 DDR
Power supply-350 watt
Sound card-SoundBlaster Audigy
Windows XP SP2 Home Ed.Did you uninstall the old drivers first? Virus/spyware protection? Any other problems with the machine? What things besides video cause the problem? Games?

Tell us about the make of that power supply and if it was new.i did remove the old drivers and disable my virus protection. my power supply is a Turbolinks LCA420ATX about 2 yrs. old. it's never been changed. The few games i have play fine and everything else works fine other then video clips or DVD's. it just freezes when trying to play video. i 've tried Realplayer, Windows Media player, and PowerDVD. it reacts the same way on all of them.Just an update on my video problem. After trying everything i could think of, with no success, i was reading about other users problems with video and graphics cards. i don't remember which thread it was, but it was suggested that the user install an UPDATED XP video_codecs program or tool. Just for kicks i tried this and ..voila! problem solved. Although i didn't get many direct suggestions for my problem, just reading about others problems and their fixes helped me out. i think this site is awsome. thanks. rowdyThanks for the follow-up info.  That's good to know.