Did you install Native Access and other software as you should ? Please see link to quick start below !
Otherwise please state exact computer model and OS version !
MASCHINE MIKRO Quickstart : SETUP CHECKLIST : https://www.native-instruments.com/en/maschine-mikro-quickstart/
MASCHINE MIKRO MK3 User manual : https://www.native-instruments.com/fileadmin/ni_media/downloads/manuals/maschine/Maschine_Mikro_MK3_Manual_English_06_12_23.pdf
MASCHINE MIKRO MK3 Cheat sheet : https://www.native-instruments.com/fileadmin/ni_media/downloads/manuals/maschine_27810/MASCHINE__MIKRO_MK3_Cheat_Sheet_2_7_10.pdf
Else if there is a problem with the hardware then you need to contact support !
Hi Leonard. Welcome to the forum.
When was the Mikro last working correctly? Have there been any changes since then (OS updates, software updates etc)?