I have an Apple IIe model A2S2064. This has mainboard 820-0073-B, B607-0264-F.
This is the PAL version of the Apple IIe, and it's a UK model.
I removed the machine from storage, and on initial poweron, the PSU was ticking. I reseated the 80col expansion card, and the machine booted OK.
However, when I powered on the machine yesterday, the machine went immediately into the self diagnostics, and reported "KERNEL OK". Rebooting the machine with CTRL-APPLE-RESET starts the diagnostic again.
The diagnostic looks normal compared to this video: https://www.youtube.com/watch?v=aOP7jwYNk6I
Except "KERNEL OK" is not displayed any more - the self test restarts immediately after the @ symbol screen.
I have tried to press CTRL-B to get the machine to boot into basic, but to no avail. The machine keeps looping the internal diagnostic over and over. If I press CTRL-APPLE-RESET the machine does reboot, so I know that the keyboard is connecting and working.
I have removed the Apple 80 Column card, and the problem persists.
Can anyone point me as to where I should start the diagnotics process?
Thankyou in advance!
Update: I reseated the keyboard cable connector, and now the machine reports "KERNEL OK" but I am unable to proceed any further. CTRL-APPLE-RESET restarts the diagnostic, to show "KERNEL OK"