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I have hard disk contain Windows 7 and Ubuntu 11 so I cloned it to new one but when I replaced it no OS working just dell mark appearing then restart by itself. In the past started up by Ubuntu menu to select Windows or Ubuntu so now how can I fix Ubuntu boot to avoid reinstall everything. Thank you in advance.

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migrated from serverfault.com Jun 15 '11 at 15:42

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2 Answers 2

This sounds like your BIOS doesn't see the disk at all. Can you check that in the BIOS POST phase the hard disk is actually recognized?

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no it recognized even I can see the size of new hard disk by the way when I plugged the old hard disk it's works! so where is the problem? –  Codey Jun 15 '11 at 15:39

Make sure you are booting from the correct device. If its a grub issue, you can use an ubuntu CD to recover it.

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