IMac screen goes "flooey".

Kittendaddy was using his indigo iMac earlier tonight when the screen took on a weird red tint. He asked me to look at it, and after asking him if he'd messed with the monitor settings, I advised him to restart. When he restarted, the screen did this:
http://s123.photobucket.com/albums/o305/kittenmommy/?action=view&current=100_654 5.flv
I connected it to my iBook and discovered that it starts up just fine in target disk mode, though the monitor still wasn't right (it didn't display the FireWire symbol, for one thing). I was able to get his iTunes music onto my iBook.
Subsequent restarts were just the same (I made the above video during one). I tried starting up from the DiskWarrior CD, but the monitor was still all funky.
Any advice?
Thanks in advance,
Kittenmommy.
iBook G4 Mac OS X (10.4.9) 80 GB HD, SuperDrive, 768 MB RAM

OK, look at the side of your machine, and does it
appear that it has Firewire as this image shows?
I'm not that much of an amateur, LOL! Yeah, I know for sure it has FireWire. Both of the indigo iMacs have it - the one with the failing monitor that Kittendaddy is using and the one that sits on the floor. Like I said, they're identical machines except that one came with a CD burner and one came with a regular CD-ROM drive.
If not, then you can't add Firewire to it, or a fast
external hard drive, and will have to settle for CD
burners which run at slow USB 1.1 speed.
I think I'm just going to tear both computers apart later and put Kittendaddy's HD and CD burner into the one that has a working monitor. I did glance at eBay, thinking about replacing his iMac altogether, but I'll be buying a new computer for myself somewhere down the road and he'll inherit this iBook. Replacing his iMac at this point probably isn't worth it.
With the monitor failing, will I still be able to use Remote Desktop to control the computer, or will my iBook's display show the same Matrix-like gibberish that the iMac's screen shows?
Kittenmommy.
iBook G4 Mac OS X (10.4.9) 80 GB HD, SuperDrive, 768 MB RAM

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IMac screen goes "flooey".

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