Do you use an external powered USB-hub? I had a similair problem after I installed too many USB-devices without using an externally powered USB-hub.
Alternatively, re-install Yamahama midi controller driver.
Good luck.
Do you use an external powered USB-hub? I had a similair problem after I installed too many USB-devices without using an externally powered USB-hub.
Alternatively, re-install Yamahama midi controller driver.
Good luck.