Question Motherboard beeps 5-6 times before boot but then boots perfectly fine?!

According to the manual, on page 153, it indicates either that the system can't detect a keyboard, or it can also indicate that it can't detect a graphics card.

Your motherboard doesn't appear to have integrated graphics so make certain that your GPU is seated properly and all power plugs are connected snugly.

Also take a look at the Debug Post Indicator (page 11, #21) and see if it's showing anything there.

EDIT #1:
Also take a look at this similar issue:
 
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