the screen is still on but it's like the computer is going idle or something, It makes watching tv shows/movies pretty hard. I have to constantly keep moving the mouse.

I have a pentium 4 with about 600 megs of ram.

Latest version of Xubuntu.

I went into screensaver options and power management options. It's set to two hours before the screensaver comes on, and never to put the screen idle but the screen seems to do it every 20-30 minutes.

I'm not entirely sure where to look now, i don't think there could be anything wrong with the hardware, otherwise moving the mouse wouldn't make the screen come back on.

Disregard. I didn't read your post clearly enough.

I might suggest going back to the power management settings and see if there is a box marked for the screen to go blank it may say activate screensaver when computer is idle