Friday, October 15, 2010

Solving the dreaded Gigabyte "Won't boot from USB" problem

As mentioned in this post, I just did a fresh install of Ubuntu 10.04 "Maverick Meerkat". I mentioned two fairly major problems I had with the Ubuntu installer in that post. I also had another problem, but this one isn't Ubuntu related.
I had chosen to install from a USB key, but what I had forgotten is that the motherboard in the PC is a Gigabyte motherboard, and it doesn't like booting from USB. This is a common problem with Gigabyte motherboards - just Google for Gigabyte and "boot from USB", and you'll see many variations of "can't boot from USB", "won't boot from USB", "unable to boot from USB", etc, etc. What happens is that the motherboard just completely ignores the USB key; effectively, it's like it isn't there.

Unfortunately, there isn't a solution to be found in any of those posts. Or at least I ran out of patience before I found one, although it's clear that the problem is to some extent USB drive dependent - Gigabyte motherboards seem to like some drives, others not. So rather than continue to go through endless posts that don't offer solutions, I started playing around. What I found was:
  • With any other drive in the machine, even if the boot from the drive was disabled in BIOS, the Gigabyte motherboard would still ignore the USB key and boot from the other drive;
  • With all other drives physically unplugged, boot would fail with a "Insert boot disk and press enter" message. The light on the USB key didn't even flicker at any point in the process, indicating that the USB key wasn't even being seen;
  • However, that was where things got interesting. What I found was that if I then unplugged the USB key, and plugged it in again, then pressed enter, the USB key was recognized, and the machine booted.
Now this is a step in the right direction. If you don't have any other bootable drives in the machine, then you can just follow that procedure.  Problem is what if you do have other drives in the machine? In my case, the intention was to install Ubuntu on a dual booted drive, so having a bootable drive in the machine was required, and the there wasn't any way to get to the "Insert boot disk" prompt - the machine just booted from the drive I wanted to install Ubuntu to.

The Solution

Thinking about this, the USB key only being recognized if it was unplugged and then plugged in again suggests that somehow, if the USB key is inserted at the time the machine is powered up, the motherboard gets into a mode where it doesn't recognize the key and it gets ignored until a operating system driver starts up. But later in the boot cycle, the motherboard does seem to be able to recognize it. So what I did was simple:
  1. I started the machine with the USB key unplugged;
  2. Once the machine had got through the first parts of its boot sequence, I plugged the key in, then hit the F12 key to bring up the boot menu. And on the third try, there the USB key was, on the list of hard drives. And it booted fine!
Two thing to note here - what I found worked, for me anyway, was to plug the USB key in just after the BIOS displayed the list of PCI devices, and just as it gave its "Verifying DMI pool" message. Secondly, note that the USB key appears on the list of hard drives.

Now I must admit, plugging the USB key in during the boot sequence is neither elegant or reliable - you'll probably have to try it a few times - but it worked for me.


RaZ said...

God, thanks for your tip. Gigabyte motherboards are a huge pain in the ass for USB boot. I can't believe that in 2010 we are reduced to plug our usb keys ata certain time for them to work.

Chris said...

Anyone else looking for a solution to this I found that with an F8 bios update I could not boot from a USB stick, when I down graded to F6 I could. NFI why...just telling that it works.

Ferda said...

I can recommend GA-EP35-DS4. Gigabyte, but no problems with booting. Or maybe it was becasue I used unetbootin instead of manually syslinuxing the USB stick.

--- Ferda

rtalcott said...

I have 4 ma785gm-us2h boards...all booted from usb until I upgraded 3 to the F12A BIOS so I could use a few more cpu's...the 3 upgraded boards lost their ability to boot via usb the one board that I did not upgrade will boot from the same usb that the other three will not.



yeah i too was searching for the options that where will it show the 'USB' option in the boot menu!!
But later I noticed that there is '+' symbol in the front of 'HDD' ( the first option. selecting whic Menu expands and there bingo! here is your USB disk and HDD.
Though i updates the bios to next version too.
Somehow..this article helped..ha ha

Rolando Islas said...

Thank you. Your solution worked perfectly on the first try. I am not sure, but I think that the Gigabyte motherboards have trouble seeing MBR usb drives. I only had OS X installed on my machine since I built it and never had any trouble loading the GUID usb drive installers. This is just a theory based on my experience. I may be wrong.

sl said...

[SOLVED] Here is how I got around this problem. My particular motherboard is Gigabyte GA-E350N.

It would refuse to recognize/boot any of otherwise perfectly working USB images.

The method that ALWAYS works for me is to use SanDisk Cruzer Fit USB stick. I have tried 5 different sticks and only the SanDisk works flawlessly. I don't have to insert it at any particular time of BIOS boot sequence either. It will be recognized after you power-on the machine all the way through the boot. I used unetbootin to create the image.

Good luck.

Alexys Hegmann said...

DASHING SINGH, you're my hero!!! I thought that the + meant "default option" xD

asteria syros said...

what a pain....i was trying and trying and it was so simple...
f12, then +hard drive
and there you select your usb...

teknoku said...

thanks for the tips

idude said...

You were right about everything you said. Thank you for posting this, I sure wouldn't have figured that out on my own. Not my problem is the usb apparently doesn't have drivers on it. If is was easy to do this stuff then it wouldn't be fun!

Saurav said...

Hi what to do if even when you press the + next to the hard disk sign you don't get the USB key ?

Daniel Runebjörk said...

Great advice! Worked on my first attempt, had been rebooting for hours until I found this solution! Thanks once again!

kurt ragnall said...

if your still having issues with booting from pen drive i have a solution use a nackered windows disc to boot from cd then remove b4 installing windows so it cant try the disc it should auto select flash drive n get files from flash drive worked for me

Anderson Cardoso said...


Another solution is, using the "rufus software" to create a usb boot. (

In the advanced tab (clicking in "format options), select the option: "ADD FIXES FOR OLD BIOSes (extra partition, align, etc.)

Work great for me.

Jeff said...

Blogger Anderson your "rufus software" solutin worked for me! Thanks!