Hello orange,

orange wrote:

OK, I understand.
its a broken computer, Amiga 1200, it displays for a second blue screen
(which means one of custom chips is broken) and then black screen with
faint parallel stripes.

Amigas have very common faults. I'd give it a try to search Google
for a A1200 fault database. Also the guys on www.amiga.org are
quite into Amiga hardware (what a surprise ). The biggest
problem about repair is that none of the large chips on the
1200' board are socketed anymore as opposed to the 500/2000
which will replacement much more difficult.

Adrian