Take the 2-minute tour ×
Ask Ubuntu is a question and answer site for Ubuntu users and developers. It's 100% free, no registration required.

I have a Dell Inspiron 6400 laptop with a dead internal hard drive controller. It boots perfectly from CD or USB. I therefore removed the internal hard drive and installed Ubuntu 10.10 Maverick onto an external USB hard drive.

It boots and runs perfectly when doing a "cold start" of the PC. However, when I choose restart/reboot in the Ubuntu menu (e.g. after an update), I get this error message from the BIOS: "No bootable devices, strike F1 to retry boot, F2 for setup utility, press F5 to run onboard diagnostics". I can make the system boot again by pressing F2 or F5 and exiting the utility without having done anything. Or, I can simply power off the system and do a new "cold start".

Does anyone know the likely reason for this problem and how to fix it. It is not a big issue but an annoyance that I would like to fix if possible.

share|improve this question
    
This is most likely a BIOS/HW issue, probably the USB device is powered off during the shutdown and the power is not restored during the hot restart. –  João Pinto Jan 3 '11 at 14:47
    
I have a similar issue... but instead, it doesnt reboot even from a "cold start". I must unplug and replug the USB stick so it boots again. Any hints? askubuntu.com/questions/47459 –  MestreLion Jun 7 '11 at 13:46

1 Answer 1

Use an additional power supply for your USB hard drive. Most hard disks need more then 500mW at spin up time. This may lead to a problem if Linux suspend the USB device at shutdown.

share|improve this answer

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.