Google about a "master reboot"... sometimes on these games, the memory or the way the info is stored on the hard drive is corrupted. If you flip two dipswitches (it may be #4 and #7, I can't remember!) and then turn the game on, it does a factory reset and reconfigures the hard drive. I've had that fix a bunch of them that were resetting. I messed with them for years and didn't even know you could do that until a guy at Merit told me about it.
Also you can always call Merit, they'll help you on their tech support line even though it's an old machine!