GA-P55M-UD2: won't post with USB thumb drive plugged in

[JasonHears]

I have a GA-P55M-UD2 F11 with Award BIOS v6.00PG.  From the post screen it shows 06/23/201-P55-7A89RG0EC.  It's a Intel Core i5 3.2Ghz Processor, 12Gb RAM, a SATA 3.0 HD, and XFX HD-465X-ZDF2 Radeon HD 4650 video card.

The system runs fine.  However, I was recently trying to boot from an 8Gb USB drive, and the system hangs at the bios post screen.  I am able to boot from this USB drive on another computer just fine.

After pressing the power button, the initial post screen shows, with the text to press F12, Del, etc.  But it never proceeds down the list of checking memory, or through subsequent screens of finding IDE drives.  It is completely frozen.  If I unplug the USB drive and reboot, it boots fine.

I've been playing in the BIOS, and reset it to factory default and optimized defaults.  No dice.  I finally found that if I disable the "USB Storage" setting in the BIOS, that the computer will boot to the hard drive while the USB is plugged in, but no longer detects the USB drive as a boot option.  Changing the "USB Legacy" setting doesn't seem to have any effect.

If I unplug the USB drive, and let the system get to the boot selector screen, and then plug the USB drive in, the system still freezes.  If I plug in the USB drive at any point during the boot-up (prior to the OS loading), the system freezes.

Not sure what to do.  I've tried another USB drive, and still no dice.  It seems like a hardware or bios issue.

[autotech]

This was a common problem on a lot of the older chipset boards. Even other manufactures had the same problem.
What is the chipset on the other board you tried it in that might be the clue.

[dmdilks]

Plus they are not going to fix either. Your board is to old. Plus to this day their are still having problems with USB drives.

I run the Ga-x99-UD4 board and people are having problems. But they do have a bios update to fix it.