Yes yet another Apple II+ boot problem.
Before I get jumped on, I did search the forums and came up with 67 pages of possible links regarding "Apple II Boot" but none of them that I saw seemed to match this set of circumstances.
I am trying to help a friend get an old Apple II+ up and running. He received it totally dead and non functional.
I have recapped the Power Supply, and removed and re-seated all of the chips.
I only have the first bank of RAM populated, and I have run these RAM chips through a hardware tester and all pass without any problems. (The kit to build the tester can be found here: http://neoloch.com/products/Inquisitor.php)
When the Apple II+ is turned on, it beeps twice and dumps to monitor mode with C012 (or thereabouts - the address changes slightly)
Expanding the effort I used another known good Power Supply and get the identical result - so I know the power supply isn't the problem.
This is booting without any cards, and only 16K of RAM on the motherboard.
I know from other posts that this area is related to IO. ("$c000 - $cfff : I/O")
And a picture of the motherboard in question: