Well according to the manual an error code in the 61-91 range is a chipset initialization error. Says to reset the cmos and boot again. Might check for a bios update if it keeps happening. I have the same board for the last 2 weeks and it's been flawless, no error 64
Once the system boots there are no lights on the board including the Power or Reset button. Is this normal?
Bios under south bridge there is a good night led that controls the mb leds on off wih a extreme 77.
Once it posts I have no lights on the board. Looks like error 55 is a memory detection error I would test with 1 stick in each slot one at a time, then test the pair in 1 and 3 and then 2 and 4. If you want the memory to run dual channel it has to paired in a 1 3 or 2 4 config. but test each stick one at a time in each slot first.
Not that it matters (since it looks like you got a faulty board), but I think there is a setting in BIOS to keep diagnostic LEDs lit after boot or turn them off. By default it's off, so once you successfully boot they will turn off.
The microcenter policy is ambiguous, it says 15 days to return, but it does not clarify if the 15 days are also for exchange or not. Give them a call?