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I have ubuntu and osx installed on my macbook. It was working fine up until recently. Now, when I boot I have a 20 second period where it makes the mac boot noise and then proceeds to show a grey screen. After 20 seconds it shows the rEFIt boot loader with my options. I have tried reinstalling rEFIt and going through that installation. It continues to show the same screen. Any suggestions?

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Are there any external hard drives plugged in and turned on during boot up? That tends to slow down my rEFIt loading quite a bit, which manifests as a blank grey screen as well. –  fideli Feb 9 '11 at 7:10
    
Wow sorry, just saw this response. No there were no drives plugged in during boot. I now am experiencing issues with booting in general. When I have the battery plugged in it refuses to boot. I have to take the battery out and boot via power plug. May replace the battery to try that as a resolution. –  bacord May 19 '11 at 0:52

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