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.
I usually write a blog post about once a week. The latest post can be viewed here: Terrorism vs Genocide: Please don't feel like you need to be ashamed of New Zealand's response. (posted 2025-10-03 at 17:02:25). I do podcasts too!. You can listen to my latest podcast, here: OJB's Podcast 2025-09-09 Kiwi Values: From a practical perspective it has too many problems..
TIPS PAGE