Dual 1.25Ghz won't boot? Just happened!?

Hello, and thanks in advance for any feedback.
I have a Dual 1.25Ghz G4 with 4 HDs in it. I had it running earlier this morning and decided to pull the smaller (and older drive). I turned it off, unplugged everything, and pulled the drive. I closed the case and now it doesn't boot. I press the button and it lights up, but nothing happens. No powerup up, no power supply noise.. nothing.
So, thinking there was a slight chance my OS, or something, was on that older drive, I reinstalled it. Same thing.
What could have damaged upon opening the case?
Thanks for your help!
Justin

Hello! I'm assuming that the drives are jumpered correctly? Anytime you remove or add hardware you may have to reset the PMU. Press the button once with ALL external cables unhooked and then reconnect and restart. Tom
Below is an example of the pmu button
[IMG]http://img49.imageshack.us/img49/3729/fw800logicbd4xu.jpg[/IMG]
[IMG]http://img470.imageshack.us/img470/1623/mddlogicbd4ga.jpg[/IMG]

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