Need Help Roland SP300-V

Hello,

Picked up a Roland SP300 V recently that I was told all it needed was Servo Board. I had a local Tech come over & check out the machine. When we powered it up, no lights powered on the Mainboard or anywhere.
Checked the power supply & we have 42 Volt to the Mainboard. Supposedly the Tech sent the Motherboard out to be checked & returned it telling me everything was good.
Any idea why nothing lights up on the MB? Checked all cables, power supply appears to good, no blown fuses....
Any help is much appreciated
Cheers
John