PowerBook G4 15" 1.67gHz (Model A1138)  won't turn on (it's not battery)

I just replaced the hard drive following instructions on ifixit.com (really great site by the way for anyone wanting step by step repairs). I did it all right, but at the moment of truth... Nothing. Power's plugged in. Green light's on. It's taking a charge. But computer won't turn on. Reset PMU already. Nothing. Wondering if I fried the board with static even though I didn't feel any ever and was cautious about touch metal before anything else (plus I wore a static bracelet). I did Vacuum the inside with a brush attachment very carefully so the vac never touched, but in hindsight maybe ******* move...
I will take it to a mac store but thought I could get a quick thought from someone first.
BY THE WAY: The drive is totally empty and I didn't put a OS DVD in the drive before I replaced. Figured I could turn it on and then hold C and stuff the disk in, but it won't go on to get there.

After power-on... Do you get a light when you press the caps lock?
I would also agree with "BGreg" check the Trackpad/Keyboard ribbon cable.
And make sure that the RAM is fully seated.
I doubt that ESD would cause the Mac to not boot, in this case as it sounds like you took all precautions. Everyone should practice good ESD safety as it is always a possibility. Now using a bristle brush with a vacuum, well that's a different story entirely and that can zap it in a heart beat.

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