[ubuntu] 12.10 will not shut down

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http://ubuntuforums.org – I have a brand new Acer Aspire V5 with Windows 7 and 12.10 alongside it. When I shut down 12.10 by clicking on shut down the system restarts, It does this every time. The only way I can power down from 12.10 is by pressing and holding the power key or booting windows and shutting it down. I have read postings similar to this, all Aser aspire models, on other forums with no replies. Thank you in advance for any help. (Hardware)