Hi Master,
from green to amber could be one of many things,1 video grapics card malfunction,,,2,, dry joints in the mother board..3 bad data cable ,,pc to monitor cable vga,,failing power supply,,,,i suggest you open the pc remove the data cable to you floppy while it is off remove memory stick clean with a damp soft rag or tissue reinsert when allowed to dry for 10 mins and then restart pc without the speakers web cam and anything except mouse keyboard and restart ,if it does same thing then your problem lies in *********** board,thus you need a new one