Member Avatar for yuvaraj.s

Hi,

I am using DELL OPTIPLEX 210L Model PC. The Problem with keyboard is that it is detecting till it is booting but after it goes on the Windows log on screen the USB Keyboard is not getting detected. I interchanged the ports between the Keyboard and mouse but again the keyboard is not working but mouse is working fine. Kindly help me to solve this issu.

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Short, focused troubleshooting and fixes that extend the suggestions already in this thread (see , , ). These steps help determine whether the problem is the OS/drivers or something lower-level, and give safe actions to recover keyboard input at the Windows logon.

  1. At the Windows logon screen press CapsLock or NumLock and watch the keyboard LED. If the LED toggles, the OS is receiving scancodes; if it does not, the device is not being handled by Windows.
  2. Boot to Safe Mode (F8). If the keyboard works there, suspect a driver or service conflict. If it still fails, treat it as a USB driver/host-controller problem.
  3. Use an on-screen keyboard or a temporary PS/2 keyboard (if available) to log in so you can inspect Device Manager.
  4. In Device Manager look under Keyboards and Universal Serial Bus controllers for errors. Uninstall the USB host controllers and USB Root Hubs (do one group, reboot, let Windows redetect). Do not remove the keyboard driver while you cannot log in.
  5. Update the system chipset and USB host-controller drivers using the OptiPlex 210L vendor drivers that match the installed Windows version and service pack.
  6. Turn off USB power-saving (Power Options -> advanced settings, and Device Manager -> USB Root Hub -> Power Management: uncheck "allow computer to turn off this device").
  7. If still failing, test the same USB keyboard on another PC and try a different USB keyboard on the OptiPlex to rule out profile/driver vs hardware.

Use System Restore or a repair install if driver cleanup does not recover functionality. Back up important data before making system-level changes.

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Member Avatar for caperjack

you may need to go into the bios and set it to detect legacy usb keyboard

Member Avatar for sourcez

Has anything changed since it was last working? Any settings or drivers?

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