After a power outage my usb ports on the back of the tower do not recognise the apple usb keyboard upon start up. How do I fix this issue?

I have a Mac Pro 5.1 and after a power outage my usb ports on the back of the tower do not recognise the apple usb keyboard upon start up. If I leave the plug out and then insert the keyboard after start up it works fine. The same happens with the front usb ports. How do I fix this issue?

System.log says USB related message?
Resetting SMC as well as NVRAM could solve the problem.
Intel-based Macs: Resetting the System Management Controller (SMC)
About NVRAM and PRAM

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After a power outage my usb ports on the back of the tower do not recognise the apple usb keyboard upon start up. How do I fix this issue?

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