Pinouts, Schematics, Oh Boy - Also:Dead

The other day I picked up a Commodore 128D. [Along with a Timex Sinclaire 1000 with some sort of module hanging off of it that I'm not sure about, Also a Commodore 1541 Floppy all for $25 at a Pawn Shop) Anyhow, I plugged in the C128 and I get only a black screen. I checked the fuses and notice one had been blown. I replaced it and still only had a black screen and a newly blown fuse. I'm going to do some checks on the power supply to see if I can fix the fuse blowing and hopefully the black screen. I also have picked up an Atari 520ST with the external floppy drive - no power supplies or cables. My thinking is that I can always build those if I need to. What all of this is leading to is - Does anyone know of any good resources for pinouts, schematics, etc on the old PC's? Also, does the black screen on the C128D ring any bells for anyone? Thanks! Mike