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Why is the pc is not detecting the keyboard

Just had pc repaired, plugged keyboard back in and the pc is not recogising that it is there. Everything else (e.g printer) is working fine. Why will it not detect the keyboard?

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If these are all USB devices, try unplugging all of them after shutting down the computer. Restart the computer, let it boot up and then shut it down and plug all the USB devices in again and restart. If this doesn't work then check your BIOS settings to make sure all the USB ports are enabled.

Posted on Feb 05, 2010

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Posted on Jan 02, 2017

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I have a Dell PC and I unplugged the mouse and the keyboard temporarily to clean it. When I plugged them both back into the tower and turned on the computer, neither one worked. I tried to restart, shut...


To try to resolve the issue:
1.) Will a different keyboard and mouse work (PS2 is the name of these connections)
If they will, damage to the keyboard and mouse is likely)
2.) Will a usb mouse and keyboard work?
If they do, then the problem is with the controller on the mobo, unlikley but MAY have been casued by static.

If the USB keyboard and mouse do not work, you have some problems with the motherboard

Try switching off and unplugging the computer, remove the coin shaped BIOS battery and plug in the keyboard and mouse, wait 2 minutes or so and put the battery back, replug in and power on, see if the bios detects the keyboard and mouse (you will see the bios screen flash up a message). If the computer does nOT detect the keyboard and mouse it will (or should) flash a message on the screen saying "no PS2 keyboard or mouse detected".

If this fails to detect the mouse and keyboard and you get no message or beeps, then there may be damage to the connector ports.

If you can get a USB keyboard and mouse to work, use them, Effecting a repair to the motherboard will not be a viable option

Jan 25, 2011 | Dell Dimension XPS 400 PC Desktop

1 Answer

I am having problems with my keyboard. When I plug in an external keyboard, everything works fine, when I use the keyboard on my laptop, the characters are wrong.


Remove the keyboard from the system and plug it back in. If that doesn't work you will have to replace the keyboard. Ebay for less than $20 for a keyboard.

Jan 04, 2011 | Toshiba Satellite Pro L300 Notebook

1 Answer

My computer wont turn on at all??


- unplug everything form the back of the computer: power cable, mouse, keyboard, monitor, network cable & speakers, printer, camera (all usb)
- hold down power button for 10 secs (power cycle)
- plug in power, keyboard, mouse, network & monitor.. BUT NOT printer yet
- it it turns on, you can reconnect all other devices
- if it doesnt turn on still, call manufacturer or bring it to repair shop.. possible motherboard problem

Sep 08, 2010 | Computers & Internet

1 Answer

PC does not detects my Omega keyboard anymore


First question I'd want to resolve is whether the keyboard is bad, or you have a system problem. Plug keyboard into another PC and see if it works.

If it does, try uninstalling the keyboard using device manager, rebooting, and plugging keyboard back in.

Mar 13, 2010 | Lenovo Keyboard

2 Answers

A letter on my keyboard stopped working. Can I home-repair?


Keyboards are very inexpensive. Throw that one away and buy a new one.

Oct 03, 2009 | Dell Studio XPS 16 Notebook

1 Answer

Pc don't recogise new hardware


It sounds as if your power supply isn't putting out enough to support so many USB devices on your system. If you have an external USB Hub, do you have a power adapter plugged into it?

Mar 28, 2009 | Computers & Internet

1 Answer

Numbers keypad not working


unplug keyboard/ uninstall the keyboard driver and device/ plug keyboard back in should auto detect

Sep 03, 2017 | Dell Spacesaver USB Keyboard J4624 SK-8115...

1 Answer

Keyboard not working


Hi abcd_21;
Is that a usb keyboard or a PS2 keyboard? if its a PS2
kindly Do these steps below:
1. remove keyboard PS2 from PC
2. restart PC, and observe if you see the error "no keyboard detected"
3. turn the pc off
4. attach the PS2 kayboard then Turn ON.

if its a USB:
1. remove usb
2. restart pc
3. plug the usb in when the pc has completely booted up.
4. wait for the found new hardware icon to detect your usb

Jun 05, 2008 | Dell OptiPlex GX260 PC Desktop

1 Answer

Keyboard


If the letters and numbers don't work, what is left ?

Keyboards are electronically organized into a matrix of rows
and columns. An internal processor monitors the columns
as it activates the rows one at a time in rapid succession,
or vice versa.

If a complete column or row is bad (electronically) then
a subset of keys will not work. For a PC, the detected key
strokes are encoded into special binary codes called
"scan-codes", which are sent to the PC over a serial cable
or a wireless link.

The operating system then employs several layers of
translation to determine which keys you pressed,
based on the language and location, as well as the actual
application actively running at the time. Also the keyboard
itself is programmable and re-configurable by software running
on the PC, such that the letter "A" for example, can generate
different scan-codes, depending on the selected keyboard
layout.

On laptops, multiple functions and the numeric number-pad
are overlaid over the main alphabetical section, such that a
single key can serve many functions, depending on the current
operating mode.

1) Make sure you don't have a software problem, and that your
keyboard is not stuck in some bizarre or foreign operating
mode.

2) Make sure that the wireless keyboard's batteries are not weak
or dead.

3) Make sure that there is a clear communication path between
the physical keyboard and the USB transceiver plugged into
the computer. CRT monitors and large metal objects will
interfere with this signal.

4) Reset the keyboard: Unplug the USB cable, and plug it
back in, or re-boot the PC.

5) If these easy checks don't fix it, contact the manufacturer,
or replace the keyboard, as these things are generally not
electronically serviceable

Typically the processor/controller is a single proprietary chip,
the circuit board has multiple layers which are very hard to
trace or repair, schematics are non-existent, and the switch
mechanics are very finicky and delicate. The actual
key-switches can use dozens of different principles, including:
capacitance, inductance, carbon pressure pads, conductive
foam, printed pressure bubbles, reed switches, optics....
you name it.

There is no practical way to repair these things, and at an
average price of $25-$100 for a new keyboard, it
is hardly worth it.

Martin

May 08, 2008 | Fellowes Cordless Optical Keyboard/Mouse...

3 Answers

Usb device not recogised


When Windows does not recognise the device, it practically means the device is faulty to the point where Windows cannot even determine what sort of device it is, it can only tell that you've plugged something in and it doesn't know what. This is not down to compatibility, software issues or that it isn't installed properly. It is just a faulty unit. If it's within warranty, get it returned for a replacement or a repair - if it's not, don't bother with getting it repaired, it'd be quicker and cheaper to get a new one. Sorry to be the bearer of bad news - I test USB devices like these all the time and the situation is always the same when you get that error message from the system tray when you plug a USB device in.

Aug 17, 2007 | Logitech Rumblepad 2 Vibration Feedback...

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