I have an Atari 800XL that is going to a computer monitor via a composite cable. It has been working flawlessly for years.
The other day I left the 800XL on for about 18 hours. When I returned, the graphics were in black and white. I turned it off for a couple days and started it again and color was back.
Today I left it on for about 4 hours and it is giving me just black and white images again. I've checked that the monitor is not at fault, but I am not sure where to begin troubleshooting this. Are there terms that would help me run some searches to find other people with this problem?