Dell Inspiron 15 intel (N5010) Black Screen isuue

Hey,

I have a 3 year old Dell Inspiron N5010 with the integrated Ati Mobility Radeon 550v card.

Recently, when I run full screen applications (game, hd movie) after a while (sometimes 3 minutes, sometimes 1 hour, totally random...) my screen goes totally black, the sound continues for about half a minute, and then the computer restarts. Sometimes after the restart, the screen is having trouble coming back, and I have to restart it several times.

This happens with the laptop's own screen and with HDMI connected monitors (tried 2 different ones) as well, so I'm assuming it's a video card problem.

Can anyone advise as to what I should do with this? My drivers are the latest catalyst ones. I'm going to run the Dell Support Site's diagnostics stuff today and tomorrow.

Any help is appreciated!

Thanks!