Martin1280

Hello everyone, first off a massive thank you to everyone who's posted in pretty much every section of the forums. So far I have found answers to pretty much every question I've had.
I recently acquired my first machine, a bell fruit club cool jewels, as a freebie from a facebook group. It is a bit of a project, it won't always switch on and when it does it stays on the "initialising" cycle. Been through the psu and re soldered most of it, it's a snakes which appears to be the better one from what I've read, and I'm currently working on the scorpion 4 board as the battery had leaked but not badly and I think I could repair it.
So the questions I do have are, is it worth trying to repair an mpu? If not what should I be looking to pay for a working one? And secondly on the game card there are 4 slots for the proms and only three have anything in them, is this normal or am I missing something that could be the cause of my problems?
Once again thanks to all who have posted to germs as far as I have, and thanks in advance for any future help provided