Its not the monitor - plz help

Turned on my G5 1.8 this morning and my screen looked like this
changed monitors, same thing. The room the computer is in is very cold. It was about 30 to35 degrees in there. I left the computer on so far for about 3 hrs . I have not checked as I'm away from it.
any help?
rdee

I had forgoteen I had Tech Tool Pro installed on the volume. Looking thru all the lines and distortion I was able to boot up TTP and ran a test. Everytrhing checked out except The VRAM Test, I had to print as could not see on the monitor it shows the following:
Video RAM
Failed
Video RAM, as all components of your video circuitry, must be fully functional for graphics to be properly displayed. Damaged VRAM can cause missing bits, screen noise, system lock ups, or freezes. TechTool Deluxe tests the VRAM on the Macintosh main logic board, as well as some third-party video cards.
If the VRAM test should fail, try these steps in order and run the test again after each step:
o Quit all other applications.
o Restart the system.
o Check any recently-added hardware for proper installation.
o Run the computer from another volume (if available).
o Reinstall the OS.
o Contact AppleCare.
I quit all other apps restarted - same result
booted from another volume - same result
To reinstall the OS to me would be pointless as I have another OSX bootable disk and when I tried to boot into that the screen was still distorted.
I will try to boot into the install cd. If I still have the same problem would the video card be the culprit?
I recently installed a dual layer replacement ata drive which has been working fine. Could this be the culprit?
I will put the old ata back and see.
any other suggestions?
rdee

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