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Repair guides for the MacBook.

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Screen flashes then goes dark at start up?

Just replaced the 250G hard drive and 1 of the 2G Ram chips and after using it for a day, the system shut itself off. When I tried to re-boot, the screen flashes white and then goes completely black. I've tried restarting it a few times but that's all it does. Is there anything else I can try?

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Follow the linked Apple guide. Then I would remove the new stick of ram and see if it boots. If that doesn't work I would replace the hard drive with the original and see if that allowed the computer to boot. Good luck.

http://support.apple.com/kb/TS1367

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