technology Dead MOBO or Processor?

[Quill The Pony. 175]

2 days ago, I went to boot up my pc, however, when I turned it on, all I got was a black screen with a 99 in the bottom right corner. Apparently this means that a peripheral is messed up, and is not causing the system to boot up. So what I did was took apart my PC and tried the most barebones build, the processor and 1 stick of RAM. I tried swapping the RAM sticks in different slots to no avail. The same thing happened. My fans came on though. But, I got to the same screen. I then tried taking the cmos battery out of the board, waiting an hour, then putting it back in, again, to no avail. I've come to the conclusion that either my processor or board is screwed up. I wanna say it's the board, because I hera no beeping noises when I attempt to boot up my pc, but the fan in the tower and the heatsink work fine. I also tried just rebuilding the whole PC with all the components. Same problem. Anyways, here's my buid:

Processor: AMD A10 5800k APU
Graphics Card: Gigabyte Radeon HD 6670 2gb DDR3

RAM: Kingston Hyper X 1333 MHZ DDR3 4x2 GB RAM (Yes, I'm aware of the huge bottleneck. I plan on replacing this RAM later)
PSU: Dell G848G 350W (I will replace this soon)
Case: I gutted a Dell Studio 540 and used that as a case.
HDD: WD 500 GB HDD
MOBO: MSi FM2-A55M-E33

I wanna say that the MOBO is the issue, because I don't hear any beeps at all, but I wanna make sure before I get a replacement for the APU or MOBO. Thank you all for your time.

If there is anything else you need to know, just ask.

[GrimCW 658]

TBH I'd guess mobo first. In my Experience thats far more likely to bite the dust than the CPU. unless your fan/heatsink weren't working, full of dust, or not up to par with your clock settings.

[Quill The Pony. 175]

I didn't overclock my APU at all. And I dusted the everything out. There was no dust in the heatsink at all, a little on the tower fan, and none on the card's fan. There was a wee bit in the case, however.  The fan and heatsink worked fine however, even before the issue.

[GrimCW 658]

My best guess would be the mobo then.. I've burned a few of those out, but I cannot say I've EVER managed to burn out a CPU

 

But not sure 100%, hard to tell without extra's to test on...

[Quill The Pony. 175]

I suppose I'll RMA the MOBO. Thanks for the help GrimCW.