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I have an old MacBook 1.1 and since I upgraded to Mac OS X 10.6 it does not seem to connect to my external Monitor or TV. I'm using the Mini-DVI to VGA adapter. I've tried using detect displays and made sure the monitor is outputting through VGA.

The strange thing is I have my MacBook set up to dual boot into Ubuntu and I can use the external monitor when in Ubuntu. It seems to be software issue on the Mac OS X side.

Can anyone suggest any troubleshooting steps?

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Software update? Sounds like it might be a driver issue. –  Harv Apr 24 '11 at 20:54
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1 Answer 1

up vote 1 down vote accepted

Try resetting the PRAM: http://support.apple.com/kb/ht1379

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