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-If it is a gantry machine with 2 motors on the same axis and 2 switches, it will not jog before homing
-check if the connectors are fully seated, parallel ports tend to seat crooked sometimes
-Does LinuxCNC get out of E-stop and can it be enabled
-do the drives have enable inputs wired
-check the power supply, might reset when drives get enabled and if yes, change the PS as it means the capacitors got dry and failed, do not use
-does the keyboard have arrow keys and are you using those to jog
-check the "Gremlin" the black preview where the parts are drawn, in front of DRO is there any sign
...

I've been away from LinuxCNC for a while. I've been working on other projects. Fired my CNC mill up this weekend but the jog doesn't work and I can't run a program. I thought maybe my parallel port break out board had gone bad but I can move each axis using the "test this axis" feature in the setup wizard. I have a very simple home made machine with only and Estop and no limit switches. Could someone please refresh my memory on some troubleshooting ideas? 

Thanks

Mike 

Also, a 10A PSU seems a bit tight for 4 motor drivers!

10A PSU is more than enough for 4 stepper drives/motors.
With some reserve, even at 5A set for each motor (makes 20A), a 5A/36V supply is enough.
@LangdonS, now go read how and why that is possible, instead of posting about stuff you have no experience with.
Then, check if same is true for servo drives, and report back.