Kiwi

I haven't post here for awhile too. I think that kind of rudeness isn't necessary. People do look up to you for your advice as I do too. I love these forums and this hobby. I really LOVE the Colecovision. I want to share that sometime my personal life and my ability to focus prevent my from proceeding with this hobby. My mood and my mind goes into cycles. I'm about to focus on Colecovision stuff a bit more now. I sorry I don't post often, and I'm having a hard time knowing that I may not be accepted here. I usually try my best to be polite as possible even though I'm sometime bit hyper.

Topic on hand:

I'm pretty positive that the BIOS ROM may have worn out like some atari games due to age. Some Masked ROM don't retain there data as long as it should. I have a dead DKjr cart, some posted posted on the atari 2600 about their dead Atari 2600 cartridges. I believe that the component processor chip, z80 chip, would be the least likely to fail. The 1K of RAM maybe be higher quality than the 8 2K video RAM. The Video processor unit would have shown signs of failure before going completely.

I think it is best to replace the BIOS ROM chip with a new one would be the first thing to replace, before troubleshooting further. Most of the stuff like processor and RAM are always changes while the BIOS ROM is suppose to be static. I know the previous statement may not make sense.

This is just my analytic what may be wrong with your unit. I wish you luck with your system.