Guest sirroderick Posted July 28, 2022 Posted July 28, 2022 There seems to be a USB power issue on OCLP Monterey 12.4. I don't have any diagnostic gear to confirm this but I can't think what else could explain it. I have a USB powered MIDI Keyboard (Kawai VPC1) which no longer works in Monterey but when I switch back to Catalina it's fine again. In Monterey the power LED flashes on the Keyboard which probably indicates a power issue but the clincher is when I unplug the USB cable from the Mac Pro and plug it into my monitor the VPC1 works perfectly... Read more Source: MacRumors
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