I bought a new computer and the only things that aren’t here are the case, and the DVD drive. If the case had arrived I could at least assemble the hardware today and work on the software installation when the DVD Drive arrives. 
Ahh well.
Well, to be fair, you could go ahead and put the CPU on the motherboard, the heatsink/cooling fan on, and add the RAM.
I’m not saying you should, but you could.
I hear ya. The aftermarket cooler is arriving today, a week after the rest of the bits and gubbins and 6 days after the case did.
Years ago (I think on a 486 machine?) I had to return a board after seating it and the CUP in the case. PITA to get it out again, so now I table-test the CPU/RAM/Board before installing in a case.
Which means the case always arrives first 
The last screw or bolt will always be stuck and is most likely to get stripped.
Mm. When I worked at a computer store, an order came in for a Home Theatre PC build, which I tackled with some gusto. After 2 hours, I was all ready to power it up when my boss walked in and asked if I’d tested the case LED’s before I started working on it.
Turns out, they didn’t work. Guess what I had to do!
Sounds like you were LED astray, Casserole.