It seems as if this board DH87MC has difficulty dealing with the boot process if external USB drives are plugged in. I have a mix of USB 2.0 and 3.0 external drives connected to a rear USB 2.0 port of the board. The computer will get to the INTEL post screen (but without showing any function options eg. F2) then will "shut down" and come back up to the same screen. Essentially it is an endless loop. I can boot fine if I disconnect these drives and then plug them in after the boot process is complete. However, this is not a solution because the rear ports are not easily accessible.
The board also seems to have a difficult time recognizing USB 2.0 flash drives when connected to USB 3.0 ports on the board (either through the rear USB 3.0 ports or USB 3.0 ports via the header on the board). In some cases, the computer will crash when using the USB 2.0 flash drives plugged in to the these USB 3.0 ports.
I'm am hoping that a future BIOS update will fix these issues.
Updated info: The most recent BIOS is installed and makes no difference. Also, boot from USB devices is turned off in the BIOS.
Message was edited by: Collin Galloway