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PC stopped recognizing the keyboard

H

HiTech_32

Joined
Mar 11, 2017
Messages
313 (0.10/day)
Hello all,

I got a new USB keyboard recently and it was working fine.

A few days ago , I turned off the PC in order to reseat some cable.

But after that,when I turned on the PC it wasn't recognizing the keyboard anymore.

The keyboard lights (Caps Lock, Num Lock,Scroll Lock) don't light anymore.

I've tried plugging it into all of the USB ports I have,but the PC doesn't recognize it again.

Also the keyboard isn't listed in Device Manager anymore.

I even reseted the CMOS ,but the PC doesn't recognize it again.

I thought that the problem is in the keyboard in one moment,so I connected it to my Android phone via an OTG cable but the keyboard was working fine.

BTW ,my OS is Win 7 x64 bit.

Please help me to resolve the issue.
 
Try this and see if it shows up.

Download USBView

Download USBView 2.0.1 - Browse all USB drives connected to the PC, find out in-depth information about their features, manage them easily, run speed tests, schedule automated tasks, and more
www.softpedia.com www.softpedia.com
 
TheLostSwede said:
Try this and see if it shows up.

Download USBView

Download USBView 2.0.1 - Browse all USB drives connected to the PC, find out in-depth information about their features, manage them easily, run speed tests, schedule automated tasks, and more
www.softpedia.com www.softpedia.com
Click to expand...
After reseting of the CMOS,I am stuck on this screen :

And because the PC isn't recognizing the keyboard ,I can't pass that screen and boot to Windows.
 
Do you have a PS/2 keyboard? If you do, connect it.
 
Guess you'll have to get a new keyboard or borrow one to load default settings and deal with your keyboard in Windows. I'm out of ideas.

Edit: Try using the clear CMOS jumper instead (if there's any), or take the batter out for 5 mins again.
 
Last edited:
have you tried a different socket to plug into? try the front USB ports as well.
 
back to the keyboard, what keyboard
could be from the keyboard itself, i mean your system is fine just the keyboard that dead
 
I think the obvious thing to try first is another keyboard on this computer. If it doesn't work either, you have motherboard USB problems.
 
I removed the CMOS battery again,and the jumper too ,and when I turned the PC on the keyboard lights lighted.

But the keyboard stopped working connected to that USB port,so I connected it to an another,and this time it worked.

BTW , I also reinstalled the OS from an USB drive which I plugged in into the USB port which stopped working for the keyboard.

How do I test my USB ports?

My OS is Win 7 64 bit.
 
HiTech_32 said:
But the keyboard stopped working connected to that USB port,so I connected it to an another,and this time it worked.
Click to expand...
Thought this would work, if you do unplug the keyboard again examine the connector on it, and also carefully examine the socket on the motherboard for damage/dirt.
 
HiTech_32 said:
Could the motherboard be faulty?
Click to expand...
if the USB socket or the key boar'd cable and connector are not damaged, its very well could be.
 
Is there a way for diagnosing a motherboard ?

Also,the USB port to which was the keyboard connected and it didn't work,later read an USB drive without any problem.
 
Last edited:
I grabbed one of these when I had USB/Keyboard issues.


Will show you if the port is electronically capable or not.
 
HiTech_32 said:
Wow,thank you so much :)
Click to expand...

No problem. At least you can see if it is offering the proper voltage and amperage. However, it does not measure throughput or data, but when I thought I had USB issues, turned out that the OS had issues, not the ports. Then again, I test peripherals, and after so many registers of keyboards, the OS sort of craps itself at times.

Could also try something like this... https://docs.microsoft.com/en-us/pr...azine/ff184583(v=msdn.10)?redirectedfrom=MSDN
See if there are a bunch of ghosted USB devices that may be causing part of the problem.
 
But is there a software for testing of the USB ports?

Also how to repair/clean an USB port?

I realized that the keyboard works only on two of the USB ports.

But I can't realize why it doesn't work on the other ports ,because they work with USB drives.
 
I know of no software for testing USB ports. I would say to plug in a camera or cell phone. If you can upload photos to your computer, the USB port works.

I know of no way to repair a port. If physically broken, it can be replaced - with the necessary skills and tools.

As for cleaning, if just full of dust bunnies, try a can of compressed dusting gas. If dirty with grime and other sticky stuff, I recommend using CRC QD Electronic Cleaner or WD-40 Electrical Contact Cleaner. Typically, the power from the spray is enough for most cleaning jobs. But if the dirt is stubborn, spray with the contact cleaner then give it a soft scrub with a acid brush. Be sure to do this with the computer unplugged from the wall.
 
You can't test the motherboard. You just have to try to eliminate all other possibilities.
 
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