Mac Mini 2011 start up stuck

My Mac Mini starts up  but gets stuck on a gray screen but no apple logo.  I was going from Mountian Lion to Windows 7 via boot camp.  Can anyone help me?

Hello, see if this helps...
Bootup holding CMD+r, or the Option/alt key to boot from the Restore partition & use Disk Utility from there to Repair the Disk, then Repair Permissions.

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    Hello folks
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    ========
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  • Mac Mini (2011) can't boot, no screen display.

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    Hard to troubleshoot when you can't turn on the computer on any more.  One option is to bring it to an Apple store to have them look at it.  They will tell you what is wrong and how much it will cost to fix.  I have never heard of them charging for a diagnostic and an estimate.
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  • When I connect my Mac Mini 2011 with Lion to a TV via HDMI and an earphone cable is plugged in, it´s not possible to choose sound out via hdmi, as opposed to connection via minidisplay port. Anybody knows how to fix this?

    When I connect my Mac Mini 2011 with Lion to a TV via HDMI and an earphone cable is plugged in, it´s not possible to choose sound out via hdmi, as opposed to connection via the minidisplay port. Anybody knows how to fix this?

    Was just on the phone with Apple about this.
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