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it's so weired that i have to plug/unplug in my usb devices every time booting ubuntu. it happens for both installing ubuntu and booting ubuntu (10.10 and 11.10)

the scenario is like:

1.bios checking -> 2.grub start -> 3.keyboard & mouse led OFF (black screen with a cursor on top-left) -> 4.i plug/unplug in any usb devices -> 5.everything is back to normal and ubuntu started

it's really frustrating :( please advise the solution.

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OP are you still looking for an answer? If so, you may need to repost your question as this is flagged for closure. Regards, – Ringtail Mar 23 '12 at 18:46

press F2 or DEL to get bios menu

then uncheck boot usb first option save the settings and restart

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