Can't get into Gigabyte BIOS with USB devices attached

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Orion2000

Reputable
Feb 23, 2014
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4,510
Hi,

For a few hours I've been trying to get into the BIOS of my Gigabyte GA-Z87X-DH3. Del and F2 failed over and over on about 30 reboots. Then I tried a CMOS clear and found that the menu that comes up when you do that doesn't seem to allow for USB keyboards at all so I dug up an old PS/2 keyboard and loaded the optimized defaults.

But then, after reattaching my normal USB keyboard, I couldn't get into the BIOS again. Eventually I realized that the only thing I had changed since the last time I got into the BIOS was to attach an Anker USB 3.0 hub. So I pulled it. And then I could get into the BIOS with the USB keyboard. Reinstalled the hub - now I can't get to the BIOS again. (The keyboard is NOT attached through the hub - in fact - nothing was attached to the hub during all this.)

Known problem? Do you have to pull all other USB devices to get into the BIOS? Only USB 3? Only hubs? This system is brand- new so - so far, so I have very little attached to it. Once I start to transition to it as my main system, there will be 5 or 6 things connected back there and I would hate to have to pull them all to get to the BIOS.
 
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Orion2000

Reputable
Feb 23, 2014
11
0
4,510
Out of curiosity, I decided to boot up a Windows 7 system image CD. It went about how I feared. It asked me to press a key to continue booting from the CD but it couldn't see me pressing a key. I had to remove the USB hub for the USB keyboard to work there as well.
 
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Shaun o

Shaun o

Illustrious
Oct 7, 2007
6,113
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41,960
If you reset the bios, then use the PS/2 key board to enter the bios.
Look for and option that says detect usb legacy devices.
If it`s disabled enable it.

Save the settings in the bios before exiting.
Plug the usb keyboard back in and it should work when the required key is pressed to enter the bios.
The keyboard must be attached to a usb 2.0 port of the tower.
 
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Orion2000

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Feb 23, 2014
11
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4,510
I was wondering if anything would change if I moved the keyboard from a USB 2 port to a USB 3 port. Things changed.

Good news: With the keyboard/mouse in USB 3, I could get into the BIOS at boot time.

Bad news: The USB 3 hub no longer works. When I plug a USB 3 disk drive into the USB 3 hub, the light comes on the drive and the hub, but the drive never accesses and never appears in Windows. unfortunately, this seems to be a persistent state - ie: even after putting the keyboard and mouse back on the USb 2 ports, the disk drive is not recognized through the hub. (It had been fine a few hours earlier.) I notice that when I connect the hub, a USB 2 hub appears in the device manager instead of a USB 3 hub.

So to summarize, I still have the original problem, plus this new one.

 
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Orion2000

Reputable
Feb 23, 2014
11
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4,510
Plugging the hub into the front USB 3.0 works. So the hub and drive are fine.

It seems that plugging the keyboard into the back USB 3.0 ports for a couple of boot cycles for testing has caused all the USB 3.0 ports on the back panel to be downgraded to USB 2.0 ports and I can't figure out how to get them back to USB 3.0. In a random desperation move, I reinstalled the latest USB 3.0 driver from the Gigabyte site with no effect.
 
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