[ubuntu] problems running from hard drive...

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http://ubuntuforums.org – hi i have installed ubuntu from a usb stick. it runs successfully from the usb. when i try to run it direct from the hard drive nothing happens. i am using an acer aspire 5600. without windows xp. i have installed a new hard drive which previously ran both windows xp and ubuntu with no problems. the bios settings have been changed back to boot from hard drive, after the initial boot from usb. the ubuntu software installed all the way through to restart computer! any advise out there many thanks (Hardware)