I got an Amiga 1200 motherboard from AmigaKit, put it in my case, and it worked great for a few weeks. Then all the sudden the display went bad. I get image, but the brightness and contrast are unusually low and the colors are all shifted towards green. I tried it on a separate monitor, same thing. Another Amiga on the same monitor looks normal too. Also tried a different monitor cable off my A2000. I even tried using the composite output to see if it was related to the RGB output... composite is green too. Adjusting monitor knobs is only of limited value.

It worked fine, I was using it last night and I copied arp.library to LIBS: and it flickered between normal and green for a few minutes and now stays green. Giving it overnight rest to cool down made no difference.

I'm pretty sure installing a library didn't cause it. Its got to be hardware. Any ideas how to troubleshoot? I suppose I need to email AmigaKit too.

They offered to replace the board. Sort of a pain to have to ship it back to England and wait for a new one, but they responded quickly and are replacing it. AmigaKit has a good reputation, so I expected they'd make good on their warranty.

It's definitely hardware as I've got a similar problem with my A600 hackabout.  In my case, I've lost the green signal resulting in a red/purple display.  I'm not sure what caused the problem - whether running in 31.5KHz mode (causing it to overheat) or just old age killed it - I don't know.  But since all the video chips are SMT, it's not worth fixing. :-(

DblPal is EVIL.  Do not use it.

DblPal slows your computer down enormously.

Perhaps Dbl-PAL does slow your Amiga down (I have yet to notice this...) but my word it stops your eyes from getting fried staring at a blurry CRT television (Not really enough spare cash to be able to afford a LCD monitor, GFX card or scan doubler yet...).

Hodgkinson.

Come to think of it, my A1200 was really slow when it was non-accelerated with 256 colours and Dbl-PAL turned on.

To get around that problem then (And still now with a accelerator) leave the number of colours set to 4 for fast screen redraw. Annoyingly, it means the background IFF image I use has to *generally* be black and white.

Hodgkinson.