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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 Jun 15 '11 at 15:42

This question came from our site for system and network administrators.

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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