Amiga 500 boot issues

[Oldsmobile_Mike]

It's not super-clear from your post.  Is this a regular A500, or an A500 Plus?

[Oldsmobile_Mike]

@Oldsmobile_Mike  - it is an Amiga 500 (I'm not familiar with the Plus or how to distinguish that model from a 500 ?) I will attempt to upload a few photos later this evening.

https://en.wikipedia.org/wiki/Amiga_500_Plus

Is the battery on your motherboard, or on your RAM expansion board?  If it's on the RAM expansion board, then it's irrelevant to your problem for right now since you can just remove the entire board.  That was the question, LOL.    In any case, sounds like it's a plain A500, go with the above - check all the socketed chips for looseness, etc.  

[Oldsmobile_Mike]

Try it without the ROM switcher.

[Oldsmobile_Mike]

@oldsmobile_Mike - where is the ROM switcher located?

Um, it's that huge ribbon cable and circuit board sticking out your ROM socket. Remove that whole mess. Just stick one ROM directly in the socket. Test that way.

[Oldsmobile_Mike]

You probably ought to at least reseat the Agnus, because of this:

http://eab.abime.net/showpost.php?p=91131&postcount=3

Even if you decide to sell it, you'll get more for a "tested, working" system than for one with "unknown issues".  Or the scammer's favorite on ebay "untested, sold as-is", haha.