White screen during mavericks download now what do I do?

While upgrading to Mavericks I got a white screen, now what do I do?

I shut down and turned it back on and it seems to continue downloading where it left off.

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    Hi all,
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  • White Screen during Startup

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    Restart in single-user mode and safe mode (still just stuck on the white screen)
    Tried restarting with any USB cables disconnected
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    Does anyone rate Genius bar - can they determine what the prob is? I took a G5 tower in as it wouldn't start but they were unable to help - local PC shop sorted it charging me £100 - realised later it needed a new battery (£7) so you can't rely on anyone out there I'm afraid!
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    Does anyone rate Genius bar - can they determine what the prob is? I took a G5 tower in as it wouldn't start but they were unable to help - local PC shop sorted it charging me £100 - realised later it needed a new battery (£7) so you can't rely on anyone out there I'm afraid!
    I will need a new iMac 27 inch anytime soon but am loath to give anyone currently selling machines the money!

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