SYS-751A-i stuck at DXE-BIOS PCI BUS ENUMERATION during BIOS Boot.
Informed customer to clear CMOS and fixed the issue.
1. Shutdown and unplug power cord.
2. Remove coin battery for 5 minutes.
3. Use metal (screw driver, ..) to short two JBT1 pads for 10 seconds.
4. Put back coin battery and retest.