crwdns2934241:0crwdne2934241:0 Galen Hall

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power on no boot white screen only

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I turn it on i get white screen no logo but i hear the chime i have tried holding command + R but it does nothing i have also tried holding shift but it does nothing sometime it will turn off with just a quick press of the power button but other times i have to hold it down

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MacBook Core Duo

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open