Displays diagonal, jagged, white lines on a gray background

The eMac (1.25GHz, 512 MB RAM) does the following. It boots (grey rotating spokes), then displays jagged, diagonal, white lines on a gray background. However, when I boot it into target disk mode, there's no problem w/ the display, and I could booted my Powerbook 12" G4 up using the eMac drive as the boot drive, so it doesn't seem to be a drive issue. Whaddya think, reinstall?
It's running 10.4.11 OBTW.
Cheers,
Rex

Weird; I don't think I've seen anything matching that description yet. No display problems when booting into Firewire Target Disk mode suggests the CRT/analog assembly is mostly fine, but the expected corrupted video drivers would have been corrected with the OS reinstall. If the problem were with part of the ATI video display chipset, it would be a first to me that the native 640x480 resolution is OK but other settings are not. Still, it might be worth trying two things. One, check the PRAM battery; if you have a multimeter, it should read within 0.1v of 3.6v while under load (still in the battery holder). Battery location and replacement details are at eMac - Do-It-Yourself.
Two, try resetting NVRAM. Holding downcommand-option-p-r keys at startup until you hear three sets of chimes, then releasing the keys will reset PRAM settings (per What's stored in PRAM?). Resetting PRAM is supposed to do everything that clearing NVRAM does, but there's a long-standing body of ancedotal evidence that NVRAM is better thought of as a superset of PRAM (although this may not be nerly as true for OS X as it was in OS 9 and earlier). You can fo even firther and reset the Open Firmware settings as well. To reset the Open Firmware settings:
restart holding down the command-option-o-f keys; at the "Welcome to Open Firmware" message (black text on a white screen) type in the following at the command prompt and press return after each (case sensitive, no spaces):
reset-nvram
set-defaults
reset-all
The Mac should restart after reset-all (if it doesn't, type mac-boot and press Return)
Good luck!

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