Using the TV as a screen. halp?

I usually connect my laptop to the TV when I'm watching movies. I use the HDMI cable for my ps3. It rocks.
But now, it refuses to work all of a sudden! It gets connected and such, but I can see the screen for about two or three seconds, then black for about a half second, then screen again and so on.
I've tried to change resolution, fps etc. but it won't work ¨/
Anyone know how to fix this? :s

 

First test if the cable is still ok. Hook it up to your ps3 to check it out.

 

I have. I played like, 5 minutes before I plugged into the computer.
(It didnt work with the computer before I played today eighter, so it's not the cable)

 

Try windows key + P

But that might not be it.. try reinstalling your drivers to your graphics card..

 

could be a refresh rate problem. i suspect the computer's sending signals at 60Hz (normal for computer monitors) while the TV's at some weird refresh rate. is it LCD or plasma?