My Mac Pro won't turn on...

This has happened 3-4 times...my computer will be on; I insert a thumb drive and the screen goes black, the fan goes bonkers and the only way to get it to stop is to turn off the computer manually. Each time, the computer would restart except for this last time. The machine won't turn on.
I've got a genius bar reservation for later today but does anyone have any idea what's going on? I'll bet it has nothing to do with the thumb drive but that seems to be the constant. Although, the first time it happened, I'm not sure if I used the thumb drive.

Hello av2557 cesar05082
First try resetting SMC:
Intel-based Macs: Resetting the System Management Controller (SMC) - Apple Support
It would also help for us to know the exact size and year of your MBP.

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