my beloved Apple /// won't startup anymore... if I power it on, there is just the red lamp on the motherboard and the white/yellow one under the keyboard which work as usual. No check or anything from the floppy drive and the screen stays blank.
The only way to get something on the screen is by keystroke reset == Control+Reset, Control+Apple+Reset - after that the computer tries to access the floppy drive and after that with fingers crossed, I will get an "Retry" on the screen - sometimes it will put some extra blinking letters to that "Retry" - as seen on the attached pictures.
I uploaded a short demonstration video to my YT channel: https://youtu.be/to9KG2FWJbw
What could cause such illness to my beloved little Apple? Voltages from the power supply seems to be in normal state (I checked it with voltmeter).
If I try to boot from any SOS Disk, it will freeze - same goes for serial ADTpro - stops at kernel loading.
Any ideas what component on the board could cause such trouble? I already reseated every IC on the board, double checked the RAM-Board (5V, 256K) - same results with removed RAM-board?...
Please help me getting my baby up and running again [ ]
Edited by MarNo84, 25 August 2017 - 06:59 PM.