I have a performa 520 Logic Board that was working quite happily in a Color Classic. After not being used for a month the machine suddenly won't start up. It works fine with the original CC board.

Would a bad capacitor on the LG completely prevent a CC from powering up? I've replaced a couple of them - but so far nothing. I also replaced the PRAM battery. Is there any other component that could have suddenly failed?

It's strange as there were no symptoms of impeding doom prior to the board failure.