Macintosh Plus with Weird CRT startup


#1

Hi all,

2 wierd things:

  1. My Mac Plus on startup is initially showing the correct 2 icons but seems to be missing the greyscale background - i.e. the question mark followed by happy mac when a proper disk is inserted.
  2. After the happy mac symbol appears, nothing happens after that - it remains … er … Happy!

I have attached screenshots of the two symbols and also a third of a normal mac’s screen in comparison - any ideas?
at boot

People probably remember my original post about reflowing the power supply board.


#2

after disk insert


#3

Normal boot screen from my other mac plus below


#4

No help again, sorry, but by god those are smart looking Plusses!


#5

All right, as embarrassing as it sounds I found the issue … I was cleaning the memory chips and putting them back in when I found out that a resistor on the logic board been knocked out. A little bit [sic] of solder later and its fixed. Screen is grey again and everything boots properly.

Thank you all