EMac Display Pulsates and Shuts Down Mac

Hello, When we start up this eMac after being turned off for a long time, we get through the password screen and the programs load, but while doing this the display starts getting smaller and kinda pulsates. This gets worse as the screen gradually gets smaller and then Shuts Down completely.
We can wait a few minutes, unplug the eMac, plug it back in, start it up, but we don't even get to the Desktop before it turns itself off.
I'm a technician but only for less than two years and I've never seen this before. I'm thinking there is a hardware problem, most likely with the display adapter and the computer is shutting down before any serious damage to the logic board. Or is that the case, the logic board is toast?
Please help!
Thanks!
PhilW

I'm not aware of any software, IVAD cable, or PRAM battery symptoms matching what you describe, nor does it match the leaking capacitor issue symptoms. It does sound consistient with a bad solder joint somewhere, possiblly in the power supply to the analog/CRT assembly, in that it starts OK while cold but goes bad as the computer warms up during startup. Troubleshooting such problems requires teardown of the computer and repair of an indiviadual solder joint is difficult at best even if the individual joint(s) can be identified; realistically, at best you'd be able to narrow it down to the logic board, analog/CRT assembly, or power supply, and replace that. Replacing any but the power supply would likely cost more than the computer is now worth. When the computer shuts down, is the entire computer shutting down (including fan, keyboard optical tray eject button, and power LED) or just the display? If the computer entirely shuts down, that would actually be encouraging as it would suggest looking at the power supply first, and replacement of that could be cost-effective.
How old is the computer? Was the extended three-year AppleCare warrenty purchased for it? You could contact an Apple Authorized Service Provider and ask about their fee for diagnostic testing and/or replacing the power supply.

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EMac Display Pulsates and Shuts Down Mac

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