Hi! I am in need of assistance and I am hoping for quick reply.
Problem description: I have a problem at boot with Black Screen of Death (BSoD) with a blinking cursor in the upper left corner.
None of "system-keys" (F1-F12, DELETE or TAB) on any of my two USB-keyboards (one cabled / one wireless), seems to be able to get me into the BIOS even when connected to the PS/2 port by an PS/2-to-USB adapter.
Strangely enough the Pause/Break key seem to be able to freeze the BSoD right before the blinking cursor appear (so keyboard commands are registered some time later during boot).
When did the problem occur: I had previously used the Fast Boot utility to set the BIOS to boot in Ultra Fast Boot-mode. After a week with no noticeable difference in boot time I was attempting to revert to BOOT option to standard boot using the Gigabyte App utility to enter BIOS config from Windows 7 (SP1). On reboot the computer then went into BSoD.
Attempted troubleshooting: I have tried resetting the BIOS by removing the battery (anywhere from 20 seconds to several hours) and shorting the CLR_CMOS jumper with screwdriver/jumper as described in the motherboard manual without any notable effect. I am still unable to enter the BIOS. I have also tried disconnecting all Hard Drives (two SSD-disks) without any effect.
I'm sure my keyboards is are getting power (as the backlight lights up and the pause/break key works).
Possible cause of the problem: My best guess is that the one of the Gigabyte App utilities, either @BIOS or Fast Boot utility or both, caused the problem initially by either messing up the BIOS config or less likely: the Master Boot Record (MBR).
Even though I have tried resetting the BIOS, I'm guessing the Ultra Fast Boot-option is still somehow preventing me from accessing the keyboard or that the BIOS has somehow become damaged.
Request: I would like your advice on how to proceed with the problem. It would be a good start to get into the BIOS / Windows 7 advanced boot options menu.
Note: I'm running a self-assembled fanless-system with no movable/audible parts, with the latest version of Windows 7 (SP1), hardware drivers, and BIOS (version F7) installed. More details of my setup can be provided as needed. I am a fairly experienced computer user, and should be able to follow advance troubleshoot advice, if needed.