Some USB devices will cause the system to hang during reboot at the logo (Press Del or F2 to enter Setup) screen. Unplug the device allows it to continue!
We were having an intermittent problem with the system hanging after changing settings, but no trouble otherwise.
Turns out it was one of the USB attachments: device called a Jouse. It causes no trouble unless a change (seems any change: we tried several, including just change the wait item from 2 to 3 seconds) in BIOS settings causes it to hang at the logo screen on restart. Simply unplugging it lets it continue, and it has no trouble plugged back in once past the logo screen. Also no trouble with a restart, UNLESS something is changed, either by using AI Suite or BIOS.
Since we discovered that, no further trouble!
Interested to hear if anyone can explain why any change in the bios will cause this single USB device to hang the system, when a reboot without any change, with it still plugged in, causes no trouble.
We went thru a lot of trouble because of this, particularly since we misread the LED error code as 64, when it was b4, which is USB hot plug, whatever that means. I assume if we disable (legacy?) usb devices, it would prevent this, but then how to get into the BIOS if there is a problem on rebooting?
And why only after a change in any BIOS setting?
