Intel Motherboards : B75M-GL R2.0 not posting, A2 error

My normally rock solid gaming PC isn't even posting, and I'm not sure why. First, my specs:

CPU: I5-3550P, stock HSF, stock 3.1ghz

Mobo: B75M-GL R2.0, stock bios 1.5 (Legacy, non-UEFI)

GPU: AMD Radeon 280X

RAM: 2x4GB Corsair

HDD: 60GB Kingston SSD SATA

PSU: Thermaltake 600 watt

Windows 10 Pro

My PC was just fine at the time, and I was trying go to my bios, but the screen was disappearing so quickly I couldnt get to it. I think this is a windows 10 thing, which is a recent upgrade. With Windows 7, which Ive had for years, I was able to go into bios just fine. As noted above, this was a legacy Non-UEFI bios, so I couldn't boot right into it from Windows advanced settings.

So I start to think, well, if I'm not quick enough, maybe I can force bios to come up. I remove my hdd, so windows can't boot, hoping the pc will have no choice but to go to Bios. I get an A2 error instead, which Dr.Debug says is a problem with the SATA device...

What can fix this A2 error? Below are all my steps so far.

Troubleshooting #1:

Ok fine, I plug the hdd back into the same SATA1 plug, and I still get that A2 error. 

#2:

I place a Windows 10 install disc into the cdrom, remove the hdd, and want the pc to boot off the disc. Nope, still A2. 

#3:

I place the hdd in a different SATA plug, still A2.

#4:

I completely dissemble the pc including taking the cpu off the board. I let it rest overnight. I put all the parts back together. A2

#5:

At this point I start to think that maybe CMOS could be the problem. I ask google, 'Asrock clear CMOS'. Top result is actually this forum (http://forum.asrock.com/forum_posts.asp?TID=630&title=how-to-clear-cmos-via-battery-removal), where Xaltar explains the process. So I perform those steps. Still A2

#6:

Remove all components from case, if maybe that is causing a short or problem. My 'pc' is currently on a blanket with hdmi and power cables attached. I did forget to attach a kb and mouse, and I get a D7 error code which is about no kb/mouse. So at least the A2 isnt automatic. Plugging in the kb/mouse remove D7 and gave me A2.

#7

Email asrock support with basically this info. Await their response

#8:

Create this thread.