On Nov 12, 2003, at 06:19 pm, Marcin Wichary wrote:
Thanks. I know this part from the emulator (vMac), but the LC II never blinks or moves the drive. Would it boot if there's a problem with monitor or no monitor is attached? (I know some PCs won't.) If yes, we can narrow the problem down to motherboard (specifically memory or battery) or power supply, right?
If any Mac (with the possible exception of New World machines) does not find a monitor at startup it will not produce a picture via the video port until it is rebooted with a monitor attached. Should you monitor be faulty it could be missing the fact it's there. However you would also hear it boot...
Some other stuff to try:
Unplug the hard disk. If the logic has failed on it it could be playing up on the SCSI bus which can occasionally prevent a Mac from booting properly.
Unplug the floppy drive - it's crazy but you never know...
Remove all the 30-pin RAM from the board - faulty RAM SIMMs often cause pre-startup woes - especially on 68k macs as they run a RAM check before booting and producing the grey screen.
I'm not sure but I think the LCII has 256k of soldered on video RAM (if there is only one 68-pin SIMM socket it does) so it might be worth taking that off too.
-- Mark Benson
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