chiark,
Check Agnus is seated correctly, reseat if necessary. Good news is the system is now going through it's POST.
No instant Red means that the KS ROM is being read OK & the checksum has passed. your rework has been successfull.
Yellow indicates memory issue.... remove any memory expansions if present.
yellow / green which I have had before have been cured by re seating Agnus.
Getting there bit by bit.....
TC
