Please Help! My Macbook Pro is flashing on and off! :(?

Q: My Macbook Pro by Apple is on occasion flashing on and off when I leave it for a minute or so. It just keeps flashing until I hit the off button, then it stops and act normal. Please any help is appreciated.

A: Reboot from the Install disk. DO NOT reinstall anything. instead, when the disk mounts, choose the Utilities folder. go to Disk Utility. Run Repair Disk. Restart. Everything should be fine.

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