Lexmark CX944
User screen will not come back to the "Ready" state if the AC-Power Rocker Switch is not left in the "Off" position for at least 10minutes, and the AC-Power Rocker Switch was turned to the "Off" position while the printer was in Soft-Off or Hibernate state.
Press Soft‑Off button on side of Op‑Panel to turn “On” printer
Wait at least 10 minutes between Turn‑Off & Turn‑On when using the AC‑Power Rocker Switch
Does your printer fail to print or scan? Checking the cables, power cord, and print driver can help you solve this problem.
USB connected printers not working after installing Microsoft KB update KB5015807 in Windows 10.