Joe, it's probably the Z-axis drive that's not switched on, does it light up.? If not check the fuses if you have them. If the machines not been stored in damp conditions then I can't imagine the drives gone faulty.

Like Andy says don't let it get you down and if you still have my number give me a ring, I'll help you get Mach3 setup if it's still giving you headache. If not then drop me a PM and I'll send it.

You have built a cracking little machine with all the correct gear and it just needs the odd tweak which is quite normal. When it's fettled and you have nailed the cam side down a little better it will put BIG smiles on your face..! . . . . Like Andy says dump fusion 360 if it's giving you grief, I use SW and I'm a bit of whiz with it but fusion even gives me brain ache at times so it's not surprising folks struggle.

However, I must clarify and be fair to fusion 360 and say my son who as virtually zero experience with CAD or CAM managed to use it and generate code for a fairly complex part with adaptive paths and multiple tools without too much trouble. (Thou I didn't let him loose on my machine until I'd checked it... Lol) So I suppose it can't be that hard but we all learn technology differently and he's young at 24 so maybe picks this shit up quicker than us old farts...Lol

Anyway, get in touch and I'll soon have slinging chips.