Thanks J M, Heres my results:
1. Originally the amp would not turn on, LED was not lit.
2. I checked the fuse while the amp was unplugged and it looked fine.
3. I unconnected and reconnected the wires to the on/off switch.
4. I tried plugging in the amp again and the LED was flickering on and off. I wiggled the wires connected to the on/off switch and the amp turned on.
5. I tried turning off and on a few times to see if it was fixed and noticed a little crackling and LED flicker as I turned on.

I think it's the on/off switch or the wires connecting the switch.

I managed to wiggle around the wires connecting the on/off switch and it seems to be working. I might need to pin-point what wire is the problem or if it's the jack. Any suggestions?

I just came upon a Vox Pathfinder 10 on Craigslist for $20. Seller said it just quit and needs to be fixed. I'm new to electronic and still trying to get my feet wet. I figured this would be a great starter project.

Any help would be awesome. So I've checked the fuse and it doesn't look blown so I've moved on to check the on/off switch and the power cable. I just bought a mulitmeter to check voltage but I'm still unsure what I'm looking for.
1. Should I be on AC or DC when checking voltage on a solid state amp?
2. What voltage am I looking for when checking the on/off switch?
3. What voltage for the power cable? It splits into 3 cables when coming into the chassis. One ground and two other cables. Do I test the two non-ground cables?

Sorry for the newbie questions. Any help?