I started using Musescore 3 about a week ago, and I was successfully able to use a MIDI cable from my electric piano to my computer until today. And yes, I turned on my keyboard, then plugged in the MIDI cord to my computer, THEN opened Musescore.
Musescore v. 184.108.40.20692
Cable: LiDiVi Professional Piano Keyboard to PC/Laptop/Mac MIDI Adapter Cord
Piano: Yamaha P-140
OS: Windows 10
What I've tried:
Restarting my computer
Resetting Musescore to factory settings
Uninstalling and reinstalling Musescore
All the USB ports on my computer
What does work:
The piano works fine on its own
My computer recognizes that a MIDI device is present
NoteInput mode in Musescore does accept inputs from the letter keys
But playing the piano doesn't make any sound through my computer and doesn't update the score when NoteInput mode is on. My Musescore preferences I/O tab has PortAudio checked; there are no options to select for either MIDI input or MIDI output.
Any suggestions? All of the similar problems I've found online seemed to be fixed by a new version of Musescore, but I have the latest version, and I'm pretty sure I haven't changed anything between the last time I successfully used my piano and today.