For anyone working with old Macs, the first step is often to "recap" the board and deal with the PRAM battery.
Getting Started With Your Vintage Macintosh – Garrett Fuller MACINTOSH PRAM BATTERY
If your vintage Mac is suddenly living in 1956 (or 1904, 1984, etc.) every time you turn it on, the PRAM battery is likely dead. 2. The Danger Component (Soldered vs. Holder) For anyone working with old Macs, the first
If you're working on a specific model, I can tell you if its PRAM battery is or in a holder . Do you know the model of your Macintosh? Are you trying to replace a dead one? The Danger Component (Soldered vs
Without a working PRAM battery, a vintage Macintosh (like the Plus, SE, or early Power Macs) "forgets" its settings every time it is unplugged. This means losing time, date, and sometimes custom SCSI settings, which can hinder the boot process.