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Check the video cable, having bad raster like that is one of the symptoms I think. A popular work around was to shield the cable better (such as wrapping foil, but but being certain to ground one side and ensure it's not shorting anything, a insulating material around the foil would be better)...

Ah, I used to call that the CUDA reset (though CUDA chips are way older). IIRC if the PMU "crashes", it sucks down the PRAM battery, but this can be fixed by leaving power disconnected for a long period of time, as well as the PRAM battery, and performing the reset once again.

Could be caps or the flyback or both I think. I had a flyback failure on an early one, it mainly just smelled like ozone and then one day stopped lighting up, but your symptoms could be consistent with flyback failure. If it's just a line in one axis, that's usual horizontal or vertical...

Let me know if you find schematics. How do you reset the PMU on this board?

I have a leaky 2004 eMac, at least for me the downconverter was also badly affected. Collapsing for a split second is probably bad. Does it collapse vertically (to make a horizontal line), horizontally (to make a vertical line) or both? That might tell you which circuits to look at next.

I had an eMac with an 820-1798a board, which worked great...until the flyback blew. It was a good board, and overclocked well. I had it booting as a headless eMac following lbodnar's site. Note that later developments meant that the downconverter isn't strictly required, but I had it set up...