My Apple IIe has two Disk II drive cables, each secured to the back panel with a U-shaped clamp and a single screw. The clamp has two screw holes with captive nuts, but only one screw was installed (on the open end of the U I believe, didn't quite look). Figuring the second screw was just missing, I added one to the closed end, and the computer wouldn't power up at all. Removed it, powers up fine. Repeatable.
I must have shorted something with the 2nd screw. Has anyone else run into this? Is a single screw actually the intended installation, despite the clamp having two holes?