I've never heard of a PowerBook with a GPU detachment issue. At least all of the iBooks I've been through with that problem would power up, though they'd be without video. This thing is just plain dead. Or possessed.

I tried different RAM in different combos and everything. No components in the power section have visibly commited suicide or fratricide or anything, and voltages seem to be present where they should be, though without a real power flow diagram or anything, I can't say what's normal. Hell, even a diagram from a different PowerBook that uses the same PMU99 would be some help, at least a clue.

I think it just hates life or something, or it may be a faulty PMU. I'm not sure. I'll just have to go bid-snipe some parts off of eBay or something.