Help! Had Power Failure, now A400 won't boot...yellow screen

[alexh]

http://it.aminet.net/hard/misc/errormessages.txt

Yellow on boot is noted as a strange error (12 on this list) but I used to get it all the time on my A600 if the Trap Door Chip RAM expansion had come loose.

Do you have any spare 30-pin simms?

Swap out the 30-pin simm that is the chip RAM one.

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If you get yellow on power up, I believe that 90% of the Amiga is working.

The Amiga uses the 68k CPU to run POST. This means your CPU is working.

It uses the kickstart ROM to load the test routine that runs. It also CRC's it and this means your kickstart ROM is intact. (Or you would have a RED screen)

It uses registers in the Lisa chip to change the screen yellow etc.

Check your onboard battery, acid corrosion of the tracks near the SIMM sockets I imagine that can be responsible for yellow screens.

[alexh]

£280 for that specification A4000 isnt too bad.

If it has KS3.1 and some extra Fast RAM on the accelerator and a BUSTER revision 11 then go for it.

Shame it doesnt have a graphics card or a network card but you could always get those later.

[alexh]

My mistake. They are 72-pin. Might be worth trying any you have lying around.