[ubuntu] New Installation of 12.10 (Desktop 64) won't boot

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http://ubuntuforums.org – Hi All, I've just installed 12.10 on my laptop (Compaq Presario CQ57) from My USB stick. It booted OK after installing, though it was slower than I expected (taking about a minute or so), and appeared to work well. I set the desktop background etc, and then tried to set up Ubuntu One, which appeared to hang on the synchronising screen (I left it for at least 10 minutes), I closed that down and ran the update manager, there were 50 ish updates indicated, and that completed sucessfully, I was asked to reboot which I did. The computer comes up into the Ubunto purple screnn (no text), gives the (Hardware)