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Replaced logic board now it doesn't boot past grey screen

I bought refurbished logic board that was said to have come directly from Apple as surplus. It looked great in original Apple bag. I installed the board and before I put the top case down, since it is the most difficult part of the process, I put in memory and the battery and pressed the power button. I got the bong sound from boot up but it just sits at a grey desktop. I don't get the Apple symbol and it does not come up.

Is there something else I have to do? Do I need to boot from the install DVD the first time? IF so what are the keyboard commands to do that I can't seem to get the right ones for this powerbook.

Any help is greatly appreciated.

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Turns out it was the hard drive not spinning up. I fumbled it when putting it back in and dropped it about two inches to the desk, which shouldn't have hurt it but.....oh well. Guess I get an upgrade.

Thanks for the quick responses.

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I would try resetting the PMU and PRAM before doing anything else. I am including a link on resetting. Good luck. Ralph

http://support.apple.com/kb/HT1431

http://support.apple.com/kb/HT1379

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Also, be sure to check the display data cable's connection to the logic board (indicated in step 21 here). The display data cable provides picture, so a grey screen can be indicative of a bad connection.

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Sound advice--if the resets don't work recheck the connection. Ralph +

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Craig Beveridge zal eeuwig dankbaar zijn.
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