Won't boot without resetting CMOS

[ItsRapidDave]

Here's a little system information to start off with.

Motherboard: GA990FX-GAMING Rev 2
CPU: AMD FX-8350 4GHz
GPU: Radeon R9 390
RAM: 16GB DDR3
PSU: Corsair 800w (Can't recall specific model name)
BIOS Rev: F2

So after switching cases for my computer, I've run into a few problems, the worst of which seems to be with my BIOS, my PC simply will not boot unless I reset the CMOS before hand (Luckily I have a reset CMOS button on my motherboard). If I don't reset the CMOS, the PC will stay in post-boot, with my keyboard being unresponsive.

Once I reset CMOS and boot up, often, the clock is wrong, I've looked through the settings and it's all meant to change the time automatically. I've replaced the CMOS battery and still I have the same error. I've even tried updating the BIOS and it hasn't made any difference at all.

I'm not sure what else could be causing this problem, so any help would be greatly appreciated.

Thanks.

 

[BFG-9000]

Does it do this when there's only 1 stick of RAM installed? (as this happens if the BIOS has trouble negotiating the RAM settings)

And, does it still do this if removed out of the case? (as that's the only thing that's changed)

 

[ItsRapidDave]

Does it do this when there's only 1 stick of RAM installed? (as this happens if the BIOS has trouble negotiating the RAM settings)

And, does it still do this if removed out of the case? (as that's the only thing that's changed)

I'll check the RAM in a moment, but it's gonna be pretty time consuming to get it out of the case, so I want to do that as a last resort.

 

[ItsRapidDave]

Does it do this when there's only 1 stick of RAM installed? (as this happens if the BIOS has trouble negotiating the RAM settings)

And, does it still do this if removed out of the case? (as that's the only thing that's changed)

Okay so I've swapped the RAM, tried different RAM, tried RAM in only certain places and all other things, I don't think the RAM's the problem.