I upgraded the OS on my iMac to Lion from the App store; and after installation, it restarted and now the operating system won't start up.... it keeps displaying the apple/folder with a question mark and a circle with a line through it! Please help!

I upgraded the OS on my iMac to Lion from the App store; and after installation, it restarted and now the operating system won't start up.... it keeps displaying the apple/folder with a question mark and a circle with a line through it! Please help!

Try starting up with your Snow Leopard DVD and see if the disk can be repaired. Once you are at the installer screen go to the Utilities Menu and choose Disk Utility and choose repair disk. You might also want to try Diskwarrior.
Hope this helps.
Ben

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