Aurora R10, 2:1 code, system board failure

It boot up all the fans turn on and my graphics card fan turns on, but I get that error code and have no display

try replace cmos battery w a new one and RTC reset/clear cmos.

@redxps630​ I have done this before I asked for help 

try use a very simple and verified working video card to replace the current gpu.  remove all rams and only install one ram stick in DIMM1.  disconnect all usb devices connected to pc.

I am having the same issue with a customers desktop. Original issue was that computer would not boot up. Try to turn it on, comes on for 0.5 seconds and turns right off. Tried a different power supply at the time and same thing.

Replaced the motherboard and now PC is doing 2 yellow to 1 yellow code. Got another board in and replaced it - same issue. Could it be another board issue or something else? I have been reading about the RAM speeds that if faster speed than original from bios it could need to be updated. however I cannot get into BIOS at all.

• Tried the RAM slot in the 1 area 
• Reset CMOS (battery out and hold down power) - no change
• Tried a known working CPU 5600 - still same issue
• Tried a slower RAM - still same issue
• Tried different power supply (again) - still same issue
• Tried unplugging all but the cable that does the front lights ( tried without it plugged in too ) but still all same issue (except for unplugging light cable I am unable to see the 2 yellow to 1 yellow)
• Removed M2 drive and tried SATA with USB windows to boot from there - no display no change
• tried a known working GPU , still no change

Scratching my head here.