Hi Joe - thank you SO much for your response.
- I have shut down and restarted the computer
- I have reinstalled the drivers
- I have tried another keyboard, same result (the keyboard shows up in my MIDI devices, it's my only MIDI device, but nothing happens in Garageband when I play)- though the keyboard is on and working perfectly
- I can't try another computer because I only have one Mac, my other laptop is a Dell
- I created a new test user and tried that and got the same result
There's no need for me to refresh my MIDI Setup because the keyboard shows up every time, though I have refreshed it just to see if it made a difference and it didn't
The keyboard is a Yamaha YPG-535 88 Key Portable Grand Keyboard, and I have checked that the drivers are compatible with my OS version, but sorry I'm not sure how to determine if the "keyboard's firmware" is compatible with my OS version. But I was able to record MIDI from this keyboard into FL Studio about a week ago. Then suddenly it just stopped working. I don't remember trying to record MIDI in Garageband until this issue happened, but I'd think the fact that my keyboard already transmitted MIDI data to FL Studio is proof that the keyboard's firmware is compatible with my OS version.
When I try out the keyboard in Garageband I select Software Instrument for the first track of the new project. Then it shows the new project with only that track and it automatically sets it to Classic Electric Piano. That's what the Software Instrument track I just created gets named/set to automatically. I am pretty sure that I "have an instrument track selected and a virtual instrument loaded"- but tell me if I don't? I do NOT see a little blue dot in the upper right corner of the display. And when I hit record and play no region of MIDI notes is created. Not sure if it stays blank if that means a blank region was created, but it stays blank.
Also, when I was able to record MIDI in Fl Studio there was activity in the program when I played notes, even if I wasn't recording - and that also stopped suddenly. I don't know if this matters or not bc we're discussing Garageband, but while FL Studio still shows the keyboard in my MIDI devices and it is enabled, it doesn't really seem connected because it's not reacting at all anymore when I play notes on the keyboard. I feel Garageband would/should do the same. That is, whether or not I've hit record, when I have that Software Instrument track selected and I play something on the keyboard shouldn't Garageband register that data? Wouldn't it show some sort of movement, or better yet make the Classic Electric Piano sound it's supposed to make?
Lastly, I tried playing that track from the popup keyboard window and that works fine.
What else can I do??? Any and every idea or suggestion is welcome!