Dead CPU is unlikely; lots of other failures much more likely.? Your power supply is not powering on the CPU, so it can't finish powering up the switching power supplies.
In other posts a common failure from a power fault was D109 - check it first.? And a power supply test process is detailed in the wiki:
/g/QRPLabs/wiki/37128Much of this same process is applicable to the on-board power supplies in rev2 - the design of the power supplies didn't change, only their placement.
