A few first lines of rescue:
If the Macs have been stored without an umbilical cord to the mains voltage supply, replace the half-AA 3.6V lithium PRAM batteries. Removing dead batteries removes an impediment, but provides nothing to maintain PRAM settings.
Remove and clean the contacts of the RAM cards with a pencil eraser, blow out their slots, and reseat the cards carefully. System RAM is also used for video in the AIO Compact monochrome Macs. If you use only one bank of RAM there must be four cards in bank A. There are few early Macs that can use 8MB cards.
Make sure, while you are inside the Mac, to check that all cable connections are intact and well-seated. That includes the video card on the back of the CRT, and connections to the analogue board. Inspect the logic board for signs of leaking electrolytic capacitors, shown by stains, corrosion and/or goo on the board.
Make sure that the HDDs have not been jumpered, unless you are prepared to live with a SCSI ID other than 0. If their data cables have cut-outs in them for old, old drives, replace the cables. Do the drives spin up when powered?
Reset ('zap') PRAM at the next startup: command-option-p-r held down immediately after switch-on, and released after three more chimes. If there is a working and bootable hard drive present at SCSI 0, that should find it.
Your Disk Tools floppy, in case you have to update/replace the HDDs' drivers, or reformat HDDs, will also help you to check the function of the FDD, and give you an alternative startup volume, as you are aware. If only the FDD works, System 6.0.8 can be downloaded for 1.4MB and 800kB floppies.
If you wish, post back with your progress.
de
If the Macs have been stored without an umbilical cord to the mains voltage supply, replace the half-AA 3.6V lithium PRAM batteries. Removing dead batteries removes an impediment, but provides nothing to maintain PRAM settings.
Remove and clean the contacts of the RAM cards with a pencil eraser, blow out their slots, and reseat the cards carefully. System RAM is also used for video in the AIO Compact monochrome Macs. If you use only one bank of RAM there must be four cards in bank A. There are few early Macs that can use 8MB cards.
Make sure, while you are inside the Mac, to check that all cable connections are intact and well-seated. That includes the video card on the back of the CRT, and connections to the analogue board. Inspect the logic board for signs of leaking electrolytic capacitors, shown by stains, corrosion and/or goo on the board.
Make sure that the HDDs have not been jumpered, unless you are prepared to live with a SCSI ID other than 0. If their data cables have cut-outs in them for old, old drives, replace the cables. Do the drives spin up when powered?
Reset ('zap') PRAM at the next startup: command-option-p-r held down immediately after switch-on, and released after three more chimes. If there is a working and bootable hard drive present at SCSI 0, that should find it.
Your Disk Tools floppy, in case you have to update/replace the HDDs' drivers, or reformat HDDs, will also help you to check the function of the FDD, and give you an alternative startup volume, as you are aware. If only the FDD works, System 6.0.8 can be downloaded for 1.4MB and 800kB floppies.
If you wish, post back with your progress.
de