Trouble booting MSI X99S Gaming 7

redsoxfaithful

Commendable
Jan 22, 2017
5
0
1,510
I've been using this build for the past two years with minimal changes (the big one was adding a 2nd GPU, but that was about a year ago), with no problems:

MSI X99S Gaming 7
Intel 5930k
2x Nvidia 980s - SLI
Ripjaw 32 GB DDR4

Up until yesterday, I was using a 128 GB Samsung XP941 as my boot drive, with an 850 EVO and 850 PRO as storage drives. I decided to upgrade the XP941 to a 500 GB 950 EVO, and I wiped the two storage drives, too.

I installed Windows 10 to the 950 just fine, but I noticed some issues when I tried to reboot-- unless I specifically selected the 950 in the boot menu, the BIOS would kick me to a screen that said something like "bootable device not found, reboot with bootable drive". This was even with the BIOS specifically having the 950 listed as the #1 boot priority.

That was fine, but now when I try to boot, I can't even get to the BIOS screen. This started with me restarting the PC this morning, when it was working fine. I just disconnected the GPUs, SSDs, and M.2 drive to see if there was anything obvious going on, but everything looks fine there. The motherboard has a debug code of 04, which means "power on south bridge initialization", according to the manual. The monitor reads "DisplayPort not connected".

There is a backup BIOS switch on the motherboard, but when I flip it to 'A' from 'B', it just continuously reboots itself after ~3 seconds of trying to initialize.

I know this sounds like a hardware config problem, but any ideas?

Thanks...
 

redsoxfaithful

Commendable
Jan 22, 2017
5
0
1,510
Update: I just went in and reset CMOS (via battery removal, because I couldn't find the damn jumper).

Still nothing doing, but different debug codes when I try to boot now.

Cycles between 04, 55, 60, 61, 62, 66, and AF.

According to the manual, 55 is Early Memory Initialization, 66 is Late CPU Initialization. Not sure what 60-62 and AF are for. Manual doesn't have them listed.