G4 PPC, display has bad stripes - monitor or the card?

I've got a G4 PPC tower, using OS X 10.4.11 (Tiger) with a NEC monitor and ATI Radeon 9800 Pro card. After a planned power outtage in my town, the monitor looks totally wonky after starting up again. There are vertical cyan stripes made of short horizontal lines on light background areas, and red stripes on dark backgrounds. Is there a way to test to see if it's the graphic card that's doing this? On start up the display looks correct (although it displays a warning that the display is not connected), but it reverts to this weirdness once I get to the desktop. Also, how can I get the resolution reset to its original 16:9 ratio, millions of colors, 60 hz? I was "fiddling" with some of the display options; first it went to 800 x 800 stretched and now it's too fine and doesn't fill the screen like it did before.
Here's a screen shot: (my screen saver is a slide show of some knitting projects, but you can see the red stripes on the black pants.)

Without another monitor, this older article suggests booting into Safe Mode (hold down shift at Startup) which should give you a default setting, then resetting the resolution with:
System preferences > Display
It also lists a "nuclear option", to start in Single-User mode and remove a preference file.
Mac OS X: No video after changing resolutions in Display preferences

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Hi there!
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I took it to an authorized applecare provider to look at and they had a waiting list. They called me back the next day and said it was fixed. Turns out, all they did was check Display settings and change wallpaper. It was near closing time, so I left the Macbook with them to continue working on. The next day I got a call saying they were ordering a new inverter cable. A couple of days later, I got a call saying it was fixed. It wasn't. I drove back and re-explained the problem to an apple tech. He called in another apple tech in to look at it (who was frustrated). Finally, the first apple tech recognized that gradients weren't displaying smoothly (I used the last Abstract wallpaper to show him).
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G4 PPC, display has bad stripes - monitor or the card?

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