Flashing white screen. Missing dock. Slow computer.

Restarted the computer. When it rebooted the computer's dock was missing at the bottom and the screen flashes white every so often. The computer was running very slowly and inoperable.

Hi DamiansQ-
Greetings and welcome to the Apple boards.
Did you repair permissions on the hard drive?
Is it possible for to you boot from the installation disk and use the Disk Utility to do so now?
Luck-
-DaddyPaycheck

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