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Windows 7: NUMLOCK LED blinks continuously after keyboard "disconnects"

23 Jul 2015   #1

Windows 7 Ultimate 32-bit
NUMLOCK LED blinks continuously after keyboard "disconnects"

Just this morning, I was surfing the web doing nothing in particular (other than surfing the web that is). Suddenly I heard the USB driver "sound". What's curious is that this sound wasn't one which indicated a device being ejected but one that was being newly plugged in (PROBLEM 1). Then the keyboard NUMLOCK LED light began blinking continuously.

All other devices (mouse, speaker, printer etc) were working fine. But the keyboard stopped working, except of course for that incessant blinking (PROBLEM 2). Well, I rebooted and things didn't seem to work. I unplugged both the keyboard cable and the cable which connects to the USB port ON THE KEYBOARD to other slots and it worked. I also plugged in a pen-drive to the previous two slots, and in both instances the pen worked. So I reverted the two cables of the keyboard to those slots, AND IT WORKED.

My question is what would this entail. So far the keyboard is working fine. But what could cause such an anomaly. Besides, I had NOT activated the "allow your computer to disable device" under Power Options.

Help much appreciated.

My System SpecsSystem Spec
23 Jul 2015   #2

Windows 7 Enterprise x64

since it worked on two other USB ports, try the other one again and see if it does it again because i have a feeling it could be that first usb port you initially used.
My System SpecsSystem Spec
23 Jul 2015   #3

Windows 7 Ultimate 32-bit

Thanks. I must mention two things here as well

1. My mouse was attached to a USB port (not these two) earlier. It stopped functioning, so had to attach it to the USB port at the front. Now the mouse also works in the previous slot.

2. The sound being emitted was one which indicates a device being PLUGGED IN, which means that (technically) the USB keyboard wasn't disconnected.

Could this indicate motherboard failure, since the mouse scenario occured almost six months back and no problem came since then. Or is it relevant to the mouse and keyboard alone (i.e. that either they are failing OR they are momentarily making me worry?)

Thanks again!
My System SpecsSystem Spec

23 Jul 2015   #4

Windows 7 Enterprise x64

to properly diagnose your motherboard read this:
How to Diagnose Motherboard or Processor Problems |
My System SpecsSystem Spec

 NUMLOCK LED blinks continuously after keyboard "disconnects"

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