crash watching videos

I use 3 screens, one on a nVidia GeForce FX 5200 (PCI) and two on a nVidia GeForce FX 6600.
I can watch TV in Media Center or watch videos with WMP on my "FX 5200-screen". It works fine except that the card is a PCI-card and the video is therefore jerky.
If however I watch videos on one of the other two screens (via GeForce FX 6600), the system crashes after 1 minute or so. No bluescreen, no reboot, no shutdown. Instead it looks like the system shut down, but the power-led flashes. When that happens, I cannot start the system anymore by pressing the power button - I need to cut the power and wait for 30s.
How can I find out what happens? A problem with the graphics driver? Any ideas on how to improve the situation? Is it a build 5456-problem?
There are no entries in the event log after the crash.

That happens since I changed to build 5456. In Beta2 Videos worked perfectly (Media Center didn't show TV).

"Simon" wrote in message

I use 3 screens, one on a nVidia GeForce FX 5200 (PCI) and two on a nVidia GeForce FX 6600.
I can watch TV in Media Center or watch videos with WMP on my "FX 5200-screen". It works fine except that the card is a PCI-card and the video is therefore jerky.
If however I watch videos on one of the other two screens (via GeForce FX 6600), the system crashes after 1 minute or so. No bluescreen, no reboot, no shutdown. Instead it looks like the system shut down, but the power-led flashes. When that happens, I cannot start the system anymore by pressing the power button - I need to cut the power and wait for 30s.
How can I find out what happens? A problem with the graphics driver? Any ideas on how to improve the situation? Is it a build 5456-problem?
There are no entries in the event log after the crash.

That happens since I changed to build 5456. In Beta2 Videos worked perfectly (Media Center didn't show TV).

Check (eyeball) the fans on the GPU. My 5200 started acting up under Vista (Silent Crashes), turned out the fan was failing. I kludged on a better fan AND wired it to the Motherboard fan connector which has a speed detector.