Question about Dell Dimension C521 PC Desktop

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Usb issue usb keyboard and mouse do not function at the login screen in normal boot or safe mode. devices will work if i boot into the system with erd commander

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  • markillr Feb 16, 2009

    the system in question does not have a ps/2 port nor do i have an adapter to go from ps/2 fem to usb male

  • markillr Feb 16, 2009

    Yes, its enabled. I seems like its missing drivers...its windows media center edition 2005.

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Do you have a ps/2 keyboard/mouse? Or a usb->ps/2 adapter. I'd say boot up normally and log in with the ps/2 keyboard/mouse. Then, from device manager, right click everything under USB and such and uninstall. Then right-click your computer name in the device tree and scan for changes.

Posted on Feb 16, 2009

  • Jason Edinger Feb 16, 2009

    Check in your bios for a usb enable command. Let me know if that's on/enabled.


  • Jason Edinger Feb 16, 2009

    Check in your bios for a usb enable command. Let me know if that's on/enabled.


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If there is a mini-USB port or USB port plug in a keyboard to try and complete the login process.

If this a Windows 8.1 system you can enter recovery mode chose to open in safe mode first to see if the keyboard comes back. If that does not work chose to restore the system to a point before you could not access the keyboard, or just select refresh the OS to resolve the issue. Remember if you refresh you are NOT deleting your user files or settings you are just refreshing the OS. If you reset you WILL BE resetting the OS to the way it was when you first purchased the device.

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I'm thinking your keyboard is dead because of the battery or a virus has hijacked your keyboard.

Try booting up in Safe Mode to make sure it's not virus related. Turn the computer off, then turn it on and immediately start hitting the F8 key repeatedly until you see SAFE MODE. Select the Safe Mode option and let it boot up. Safe Mode will look different because the icons are bigger and the screen is darker, this is normal. If your keyboard works in safe mode then you might have a virus that can't function in safe mode.

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1 Answer

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Sounds like the battery in the keyboard is dead. Also make sure you have the wireless doggle that came with the keyboard and mouse plugged into the usb port. You might try plugging it into another port.

I'm thinking your keyboard is dead because of the battery or a virus has hijacked your keyboard.

Try booting up in Safe Mode to make sure it's not virus related. Turn the computer off, then turn it on and immediately start hitting the F8 key repeatedly until you see SAFE MODE. Select the Safe Mode option and let it boot up. Safe Mode will look different because the icons are bigger and the screen is darker, this is normal. If your keyboard works in safe mode then you might have a virus that can't function in safe mode.

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1 Answer

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Sounds like the battery in the keyboard is dead. Also make sure you have the wireless doggle that came with the keyboard and mouse plugged into the usb port. You might try plugging it into another port.

I'm thinking your keyboard is dead because of the battery or a virus has hijacked your keyboard.

Try booting up in Safe Mode to make sure it's not virus related. Turn the computer off, then turn it on and immediately start hitting the F8 key repeatedly until you see SAFE MODE. Select the Safe Mode option and let it boot up. Safe Mode will look different because the icons are bigger and the screen is darker, this is normal. If your keyboard works in safe mode then you might have a virus that can't function in safe mode.

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1 Answer

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1 Answer

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