Need help fixing A4000

[magnetic]

Hey sorry about your problems. Did you try another cpu board? When you power the unit up press the Caps Lock repeatedly. Tell me if they light stays lit after like 7 hits.. this diagnoses cpu.. Even with a bad CIA it should boot afaik. I wouldnt just willy nilly change cias unless you know thats the culprit.  And no there is no "romable diagnostic" roms.

[magnetic]

Does the Caps Lock key light at all?

I have a nice A3640 board for sale.

[magnetic]

Yes a dead CIA can zombie the system. In many cases you'll notice one running much hotter that the other. Seen it a couple of times.

Plaz

This is accurate, generally bad chips run hotter than good ones, so you can spot bad ones by this. However, generally the amiga will boot with a bad cia no?

[magnetic]

Jumpers factory default, try with an A3400 68030 w or wout copro .
Maybe problem is in cpu card or slot
hope this help you

We wouldnt need to guess if the CPU is good or not if he does the CAPS LOCK trick I said earlier. This determines if the cpu is the problem or not.