I am getting rather concerned here. Turned on PC this morning to receive a DD error code on motherboard. Try to enter BIOS and I can't, I just get black screen and A9 error code. My manual simply indicates that A9 is 'start of setup, BIOS if needed requested', and there is no mention at all of what DD means. I have tried clearing CMOS but that does nothing to help. It was all working fine yesterday. I have an MSI X99A Titanium and this is a custom loop, so dismantling is going to kill me. Any ideas? 