Ok, it goes like this. I have been experiencing random reboots for a few weeks. So i set the option "Do not reboot on system failure" on and now, all of a sudden, sometimes after 6 hours, somtimes 20, the monitor turns to vertical green, blue and red lines. about 1/8 inch thick and all over the screen.

After that my only option is to power down the computer by holding the power button down since nothing else responds.

I used an air compressor to clean the whole thing up and i thought that would help. Turns out that it did it again.

It comes back to normal when i reboot.

I thought of the power supply and i'd like to change it, but i never did this before and i don't even know if that would do it. Another thing to mention is that i'm not using a power bar, but a 6-plugs adapter (3 up, 3 down). I already know somebody's gonna tell me that it's not the best, but i've been using that for months and it just started doing that a couple weeks ago.

Anybody has an idea what's wrong? If you need more info on my settings or whatever, i'll give it gladly.

Thanks!

try the monitor on a friends computer.
and try a diff monitor on your system

If you have a video card mounted in a PCI or AGP slot, take that out, blast the slot and the connector on the video card with compressed air, and put it back in.

If you're using motherboard-integrated graphics, do the same thing as above to all of your memory (RAM) modules. Also run memtest86 from a bootable floppy or CD. If it comes up with even just one error, you'll need to replace some RAM. Integrated graphics use system RAM as video memory, so faulty memory can cause the display 'artifacts'. I've seen the exact same thing happen on a Dell Optiplex machine with bad memory.

The Movie PC:
Pentium III-S CPU: 1.66GHz, 158MHz FSB, 512K
2GB DDR333
7950GT AGP
Vista/XP
X-Fi
Optoma 1280x720 projector
JBL 5.1 audio
and now 89 upconverted WMV-HD flicks

i have onboard graphics but i'm about to get a pci video card in a few days. now the computer for some reason is extremely slow and even after uninstalling a bunch of stuff. So the RAM option seems logical, but i just bought those 2 sticks of RAM a month ago!

I'm fixing to get a floppy disk (don't have one at the moment) to do that memtest86.

i couldn't try my monitor at a friend's yet and neither another monitor on my PC. Working on that too. Thanks for your help! I'm so glad that people are willing to share information like that. I wish i could tell y'all something useful but obviously... yeah you get it. :)