I have been following this forum for some time now, but this is my first post. Recently I bought an Apple ][+ from an auction site. After some work on the PSU I was able to proceed to the garbage screen phase :-) What happens is:
1) The power is fine, the keyboard lamp lights,
2) there is a beep,
3) the screen looks as attached, the contents are more or less random, but some 8-column pattern emerges,
4) pushing reset on the keyboard does nothing.
I started to re-socket some of the chips, what's weird is that in some of the IC-s (approx. 1 in 10) connectors were heavily oxidized, almost black, but most of them look brand new. Anyway, I removed the E row of RAM chips, as it was the only one with mixed ICs (E3 lang. card IC was different). But all-in-all RAM looks genuine, chips have little Apple logo on them. In general there is no sign of repairs or tempering with the board.
As far as I understand the "beep" signifies that at least some of the startup routing was executed and that CPU was able to access ROM and RAM(?), so the problem is somewhere else - ?
Thanks for any ideas,