Long story shortened. My Dell Alienware Aurora R1 had its CPU liquid cooler fail this past year or so. Bought a new one. Had trouble installing it. Contacted Dell; no luck there as it was so old, from like 2011.

Ultimately had to remove the motherboard and attach a different back plate. That seemed to go alright.

Alas, I ran into trouble when I went to reconnect the motherboard. Despite my taking photos and making notes, the PC will now not even boot. I am getting it to POST - where I have one short beep. I obviously did not reconnect everything to the motherboard right. I thought I have everything made note of or photographed but I seem to have missed something.

Motherboard Connections:
Green connection is 1394.
Black 6-pin is SPDIF
'Ver' is USB3
White 4 pin near ram MB CPU FAN
Soundcard - yellow 9-pin
HDD SATA2 - from SATA 2 - top right
HDD SATA4 from SATA 4 top middle
Serial ATA MB E3157 from SATA 6 top left
HDD SATA1 from SATA 1 bottom right
Marked HDD from bottom middle
MB no number from SATA 5 bottom left

I am left with a few USB cables to connect. They missed getting noted or photographed well. One of the USB cables is marked USB; it is currently plugged into USB1. USB3 is connected to my Master IO cable. USB2 is empty. The FRONT PANEL connection is connected to a blue-tipped 9-pin cable.

 I could use some help and assistance figuring this out. I may end up taking it in to a local shop for service and repair.

Thanks