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SMC Reset for Early Mac Pro

For 2012 or earlier Mac Pros which aren't fixed by a standard SMC reset, use the SMC reset button on the motherboard...

Shut down.
Unplug the power cord.
Open the Mac Pro side access panel.
Just below the drive 4 sled and next to the top PCI-e slot is a small button labeled SMC.
Press and hold it for 10 seconds.
Close the side door.
Reconnect the power cord.
Wait 5 seconds.
Start the Mac normally.

Also try a PRAM reset, if this doesn't help.

Related Tips

SMC Functions
SMC Reset Older Laptops with Nonremovable Batteries
SMC Reset on Laptops with Removable Batteries
SMC Reset on Modern Mac Desktops
SMC Reset on Modern Mac Laptops
SMC Reset on Older Mac Desktops