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Windows 7: Usb keyboard not detected

15 Jun 2011   #1
fearless2379

Win7 Ultimate 32 Bit
 
 
Usb keyboard not detected

hello,
please help me out of this frustration..
my usb keyboard works fine on my freind pc win7ultimate32bit, i have same os service pack 1 also installed, my usb is amkette company---better than local, Problemis that it was working grt for 5 months, but for past 3 weeks it is detected as a unknown device, it is detected sometimes as hid device and works well for 3-4 hoursbut then suddenly goes off and a popup with malfunction and unknown device appers all time, then it will never that day maybe 10 min sometime. i plug out all power cables,uninstall usb controllers tried everything on internet, some techniques work but no permanent solution. i even reinstalled windows last week no luck.
It works on my freind pc., diff in my freind pc is he has intel motherboard and i have biostar a785ge everything up to date,
only solution that is left is to use a ps/2 to usb convertor(i have to wait for 3 weeks).......if any technical solution is there plz help....i have many imp works to do on pc.....please helpanyone....each usb port work bcz usb mouse logitech works on each one......Help?/


My System SpecsSystem Spec
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15 Jun 2011   #2
Maguscreed

Microsoft Community Contributor Award Recipient

Windows 7 x64
 
 

Only additional thing I can think of is to check the pnp settings in the bios.
It also would not hurt to go to the power options in control panel
click change plan settings
click change advanced power settings
expand usb settings and make sure usb power suspend is disabled.
My System SpecsSystem Spec
15 Jun 2011   #3
carwiz

Windows 7 Pro-x64
 
 

Try plugging a USB thumb drive into a slot during the keyboard problem. See if Windows will recognize the thumb drive or if it's ignored and/or the keyboard comes back. Some motherboards have a problem with sleep states and as Maguscreed says, your power saving settings may be set too aggressive.

Keyboards draw next to nothing in power so it's not likely it's heating up and failing. It's most likely the power settings.
My System SpecsSystem Spec
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15 Jun 2011   #4
Maguscreed

Microsoft Community Contributor Award Recipient

Windows 7 x64
 
 

I honestly don't even know why they bother with trying to manage usb power since it's dealing with about the same amount of power as a couple of 'aa' batteries to begin with.
My System SpecsSystem Spec
15 Jun 2011   #5
hjonesMCT

Win7 Ultimate x64, Server 2008 R2
 
 

Right, I second Maguscreed's suggestions. It may be a power problem.

Also, just how many USB devices do you have plugged in? Sometimes you can have just too many external devices like USB drives, keyboard/mouse, external hard drives, etc, and tax your power supply beyond its limits.
My System SpecsSystem Spec
16 Jun 2011   #6
fearless2379

Win7 Ultimate 32 Bit
 
 

thanks guys i disabled selective suspend , actually kb was working for 3 hours that usually it does in a day , meanwhile i disablled that selective suspend under usb in power settings so i hope if it works.....permenanaently..STILL THANKS GUYS....Maguscreed, carwiz
My System SpecsSystem Spec
16 Jun 2011   #7
fearless2379

Win7 Ultimate 32 Bit
 
 

thanks guys your advice still working seems a permanent solution u saved me a lot of time ... thanks...
My System SpecsSystem Spec
08 Jul 2011   #8
Roy2U

Windows 7 Home Premium x64
 
 
Keyboard not recognised occasionally

I have a similar problem occasionally after start up. The keyboard does not work & device manager does not show any keyboard is present. On previous occasions I could fix it by restoring computer to a week earlier, and then right clicking on Human Interface Devices in Device Manager and making it search for the keyboard. When it showed up I updated the driver software.

Today, none of this worked but when I logged off and went to a different user, it worked! Then back to the original user and it worked again. What is going on??
My System SpecsSystem Spec
08 Jul 2011   #9
fearless2379

Win7 Ultimate 32 Bit
 
 

My System SpecsSystem Spec
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 Usb keyboard not detected




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