Windows 7 - USB keyboard and mouse do not work once Windows starts

The following happens occasionally:

The keyboard works perfectly in the BIOS, the post OFFICE and when the Windows 7/64 Ultimate starts (I can tell the [Numlock] led shines). But when you see the Windows login screen, both, USB keyboard, USB mouse and stop working.

I can say this from the [Numlock] LEDS go off and, mouse and keyboard, does not.

There is no discernible specific deadline. Even wait minutes does not get the mouse or the keyboard back from work. In this case, the only way to get both mouse and keyboard, back from work is to reset the machine.

I noticed this strange behavior with several keyboards, mice and different motherboards. So, it doesn't seem to be a problem related to a particular device.

Independent since I also noticed the following:

  • I am currently using a card mother GIGABYTE Z68XP-UD3-iSSD. If I activate XDR (caching system with the small SSD disk) then Windows 7 starts up very quickly but keyboard and mouse get disabled for about 5 seconds when the login screen appears.
    .
  • During the installation of Windows, the keyboard rarely has not activate during the POST at all.

I noticed that several people share the same problem. Is this an inherent problem USB HID? Or is there a bug in Windows that should be fixed?

Hello

This might be a question of power, where Windows is shutting off the power to your USB ports. Try this:

Open the Device Manager
Click on the tree "Universal Serial Bus".
For each "USB root hub" do the following-
Right-click on 'USB hub root'
Select Properties
Click the power management tab
Make sure that the box "Allow the computer to turn this device to save power" is NOT checked.

Try restarting now. If all goes well, that will take care of the issue.

Tags: Windows

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