Oh man Atari 8bit stuff is cool AM I RIGHT friends!??!
Can anyone help me get this to boot correctly and play other games?
On the carts... try using something like deoxit on a qtip to wipe the contacts on a cart. While it's wet with deoxit, insert and remove it from the cart slot. It might just be that it's not making good contact so the games aren't executing properly. A pencil eraser might clean the cart side. Rubbing alcohol on a qtip is another thing but dunno if that would leave a coating. Deoxit is my go-to. It's a tid bit expensive and use it around open air or a fan. I have never owned an XE game system, but maybe it doesn't have a ROM BASIC for when there is no game. If one game works that is a pretty good sign. I had a huge pile of carts from a thrift store haul maaany years ago and pretty much none of them worked until I cleaned all of the contacts. Note, original atari carts require the insertion of two screwdrivers or similar to open the door and access the circuit board. I would try not to open the carts since that harms the label. - Ethan