My Mac Pro won't turn on, what should I do?

In the morning I used my MacBook's hard drive with an USB-SATA cabel as the "booting" hard drive. When I turned on the Mac Pro I pressed alt to choose my MacBook's hard drive as the primary driver. Everything went right.
I wanted to copy my files to my server, it was almost done when suddenly the electricity went out... I disconnected the MacBook's hard drive and I wanted to turn on the MacPro but only the grey screen comes up with the apple logo and the spining circle.
What should I do?

First try booting from your installer CD.  If successful run Disk Utility to try to fix both the external drive and the internal macpro drive. Hopefully that will fix it.

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    My MacBook Pro won't turn on. What's wrong?

    gobetty wrote:
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