Hello!
We have a unit here not working on any of the 3 A500 units, cleaned connectors, tried with the CA PSU and everytime you switch on it starts counting up around 02 (floppy drive clicks) and then A1 is displayed, and on the TV screen, a green with moving diagonal black lines is displayed.
We have 2 other ACA500 units and they both work fine on these A500 units
Thanks!