A500 Green screen problem

[dougal]

The other day i went to use 1 of my A500s .

I switched it on and only got a black screen .

I removed the trapdoor expansion and it worked perfectly . But with the expansion inserted it gave a blank screen .

Stupid me , i thought the expansion might have been upside down , so i inserted it the other way and i got a Green screen and flashing LED , after a few seconds it reboots and gives the same screen (green) .

I removed the expansion and its still giving me the same problem .

Did i destroy my chip ram ?

Anything i can do or try ?

Here is the spec:

A500 512Kb Chip Ram
Kickstart 2.04 (Pulled from a damaged A500+)

[dougal]

hmm, I think you zapped the actual kickstart roms by the sound of that...

If its the Kickstart ROM i dont mind ... Ill just replace it (I have spares) .

I just hope its not the CHIP MEM

[dougal]

Now It is a YELLOW screen ... I changed the Kickstart , i tried both 2.05 and 1.3 and now yellow screen .

I tried replacing the CPU and reseating and switching the CIA's and reseated the PAULA .

Nothig works