Apart from the obvious ones, like checking the fuse…. no, it sounds like a power supply problem.
If the meter lights still work but nothing else, then it’s an electronics problem in the power supply. If the unit is completely dead but the fuse is OK, then it’s the mains transformer. In any event send it to me at the Sound House (The Sound House, Hunsdon Road, Torquay, TQ1 1QB) and I will fix it. The cost will be a simple servicing charge of £30 plus the cost of returning it to you (In the UK that’s about £6 for a T2).
On all rack-mount TFPRO units, the fuse is in a little drawer marked 230/115…. it’s part of the power socket on the back of the unit.
Whichever voltage is the right way up, that’s the voltage that it’s selected to work with.
To change the fuse, or alter the working voltage, lever out the ‘drawer’ with a flat-blade screwdriver and the fuse will be obvious.