Two comments on the mobo:  (1) the I/O shield is built into the Dell Aurora case, so if you transferred the mobo to a new case, you'd have unlabeled connections and extra air cooling back there; (2) the power/led connection to the mobo is proprietary, so you'd have to manually re-wire the connection to the power button on the new case it won't be plug and play.  

@masonmk10 :

So before you can do a case swap, you cleaned the R8 and now it won't boot? 

R8 service manual shows power button board P/N is 29F15, identical to Aurora R5/R6.
Search the following on Dell Community for excellent discussion (it got misplaced in Dell laptops):

Aurora R5 R6 Community Discussion + Upgrades

If rewiring power button is too much reverse engineering work, options for new case include getting a working non-Dell Z370 board that has standard front panel connectors.   they are getting cheaper on used market as users move towards newer Z390 or X399 etc.  chances are your R8 cpu is still good.  Move everything over from Dell board to new one. sell the OEM board for parts, not working if it doesn’t boot to recuperate loss.

Amigo yo quiero comprar una carcasa alienware aurora r8 vendeme la que dejastes