Roger,
If you have already checked the circuit breaker and have verified that it is not tripped, more than likely there is a power failure with the PXI portion of the power supply. I would create a phone service request at www.ni.com/ask. We can only handle returns through our phone support. At that point, if you indicate that you have a damaged product, we can work with you to get it fixed.
Regards,
Andrew M
National Instruments