A4000T won't boot
 

I switched on my A4000T for the first time in about 8 years. It powers on, but remains on the black screen. Physically, there doesn't seem to be anything wrong. A4000Ts have a lithium button battery, which is not prone to leakage like the others. All the capacitors look fine; it all looks just like it should. Of course, I don't really know what I'm looking for. Maybe something has leaked, but I can't see any evidence of that.

First thing I did was take all of the extra boards out. No change. Then I took out the SIMM. No change. I tried switching from the 040 board to my PPC board, still a black screen.

I put the 040 back in and noticed that the power light flashes. It does 11 flashes, the last holds for longer than the others, like the following:

X.X.X.X.X.X.X.X.X.X.XXXX....[repeat]

Each flash is accompanied by a tiny click from the speaker.

This only occurs with the 040 board in-place. With no CPU board or with no PPC board, there is a black screen but no flashing.

Does anyone know what the flashing sequence means? Any thoughts?

I recall seeing somewhere that this could be due to chip ram. Have a look to see if any are failing to warm up. I'm not sure if piggy back method can be used to bypass this?

A faulty Angus can also do this on other Amigas although I think it usually shows green screen.

When you say "warm up", what exactly do you mean?

Literally put your finger on the chips to see if they heat up. Usually takes less than 1 min. Too hot could also point to faulty chip as well as cold chip. Just a crude way to test... you can get an idea of faulty one if others in same group appear 'different'

There doesn't seem to be any heating up on any of the chips.

Check the ROMs are seated properly. I've had similar symptoms in an A3000 and it turned out the ROMs were slightly unseated.

I've seen similar behavior when SCSI is not set up properly, either no or incorrect termination or some other misconfiguration.