My mac pro crashed. Apple genius people said to reinstall snow leopard. I did and it failed to start after i installed. I started with the power button, tried to install upgrades, and now I get only a grey screen with spining wheel.

How can I restart a mac pro that shows only a grey screen with a spinning wheel. I reinstalled snow leopard (10.6.3) over 10.6.8 because apple genious people said I had problems with my library files after a time capsule crash. I reinstalled but when done I got only a blue screen. I restarted with the power button and tried to insall 10.6 combined upgrades. I got an error message that it could not install because of an error. When I powered down and tried to restart, I get only a grey screen. My optical drive does not open so I can't restart from another source.

Restart, holding down the mouse button. That should eject the disc. Zap the PRAM and Reset the SMC.  Then, pop in the install disc, restart with it in again, select your language, and, when the menu bar pops up, select Disk Utility from the Utilities menu. select the boot volume and repair the disk.

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