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.
My latest blog post: A Different View: People whose ideas differ aren't bad, they just have a different view. (posted 2025-07-22). Warning: mysqli_connect(): (HY000/1040): Too many connections in /Library/WebServer/Documents/Owen2/Inc/Footer.m.inc.php on line 51
Warning: mysqli_error() expects parameter 1 to be mysqli, boolean given in /Library/WebServer/Documents/Owen2/Inc/Footer.m.inc.php on line 52
Could not connect to MySQL:
TIPS PAGE