Well, it's starting to look more like a computer. I finally found and installed the MOBO screws and installed the GPU card. I had to uninstall the fan power hub to get to the GPU card screws (more on that in a moment).
(I left the mess for you, Steve.)
The back is a bit messier.
I ran into a snag while installing the GPU card this morning; I dropped a screw. I spent over an hour looking for the "darned thing" (I have better words to describe it but Mama told me not to use them), turning and shaking the case every which way imaginable in hopes it would fall out, and even playing CSI with the lights out and using a flashight to go every square inch of the case inch by inch. I've looked in every nook and cranny using a mirror. The screw would have to be forced pretty hard to go behind the MOBO and, even then, it wouldn't go far so I'm pretty sure it hasn't gone behind the MOBO. Just the same, I dug out my fiber optic inspection "camera" to get a somewhat better peek beneath the MOBO and around the CPU cooler beyond where I was already able to see and still didn't see the stupid little bugger. The only thing I can think of is it fell out while I was shaking and turning the case (which took the starch out of me since that case is seriously HEAVY!
and I'm no kid anymore; my arms and back are killing me) but I didn't find it on the floor anywhere. I did have the news on TV on at the time and might not have heard it come out. I have no desire to tear everything down again; some of those cables are a real bugger to get at and route (mutter, mutter, mumble, mumble). Heck, I will have to pull out the top HDD and the rear case fan to get the MOBO out of the case.