Mac prohibitory sign snow leopard
Any of those is your cue to try Step 4.
It displays icons for any bootable discs that it sees and allows you to select one including the installation DVD. This technique is quite useful if your usual boot disk is damaged or having an identity crisis during startup. The service representatives there may be able to suggest something else that you can try.
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Ask a local user group for help: Another thing you might consider is contacting your local Macintosh user group. Try Dr. Mac Consulting: You can check out consulting services or call The best answers are voted up and rise to the top.
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The Snow Leopard installation disks that came with a computer may be usable with that computer only. The retail version will work.
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Managing a prohibitory sign at OS X bootup - CNET
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