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it should see it if it is nothing wrong with the keyboard...if you use a usb one ...and it has a disk ..install it first ..(probably it is just a 2.9 usb driver but install it anyway ) than insert the keyboard ..and restart the system ..it will see it on start .. if it is a wireless one ..insert the receiver ...press the button on it ..to start pair them ..when the leds stop blinking this means that they are paired ...restart the system and will work (for this wireless ones run the driver before inserting the receiver if it has one ) if it is a regular ps2 one ..jusr insert it by color..(green for mouse and purple for keyboard) ..and resatrt the system ..and it will see it .. in case it is disabled from device manager by mistake or error ...(for any kinda keyboard) go to bios setting by pressing del on start ..and choose optimal factory defaults ..and enter ...after that save settings by pressing F10 and restart ..this will enable any device that it was needed and disabled...After that it has to work ...By the way ..do the thing in bios first ...to be sure ..and after that try the other cases.. if you have one model of plug ..and it do not work after doing all these...it is the actuall plug to blame ..and try to change the keyboard and after case with another kinda plug ..(or change the usb in the case it is a usb one )
Trying to chomp off more of your power.You can try one or all of these:
If you have too many USB devices then try removing some or all of them. You can try and delete all USB drivers under "device manager", run a restart so that windows can reinstall them.I would also suggest updating the motherboard bios and chipset drivers.I was able to cure the problem by disabling USB 2.0 support through the BIOS. On computer startup, it'll have "Press <DEL> to enter setup> or some other key. Once in, disable USB 2.0 support and that actually fixed the problem in my case as the user didn't mind the slower speed (just needed USB for printing). Try turning off "allow USB to bring comp out of standby" It work for me. You can do this in Device manager/ USB Root Hub/Properties/Power management. If none of these options work then it's either your motherboard or your USB drive.
Restart the computer after plugging the USB keyboard into a different USB port, or remove the keyboard in Device Manager and then refresh the system to work around the issue. This will cause the device to be re-enumerated and the driver will be reloaded.
Just read this carefully as you will get a problem to your solution.
My Computer ->right click ->properties ->hardware -> device manager -> in last you will find USB controllers -> unistall all the usb controllers one by one. Restart the machine and your USB devices will be working fine