Question about BenQ (x750) Keyboard

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Disconnects Often when i restart my computer, the keyboard and/or the mouse to not work and i am forced to turn off my computer, unplug them from the back, plug them back in, and then restart..... is there something that is wrong that could be causing this problem?

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It's the old problem of drivers not loading when the system boots for the wireless keyboard reciever. There isn't anything you can do apart from try using a different usb port as the system allocates the IRQ's to the hardware and if it gets an IRQ of more than 3 or 4 this is where the problem starts, it needs to be IRQ1 (Interupt request No.1)which means that usb port is given first priority for operation.

Posted on Jan 31, 2007

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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

2 Answers

The Mouse and Keyboard are frozen and will not work. Pressed unlock mouse button but did not respond. What do I do?


Restart by pressing the Start button and keep pressing until it shuts down. Then restart.

Here is more on this subject:
http://www.computing.net/answers/windows-xp/hp-pavilion-is-frozen/162636.html

Jan 07, 2011 | HP Pavilion dv9000z Notebook

2 Answers

How to unlock the key pad on a dell latitude D600 laptop


Hi. Please do troubleshooting steps below:

1. Check to be sure your "Number Lock" or "Function Lock" keys aren't lit. These can lock out certain parts of your keyboard. If either of these is lit, press them to unlock the locked portion of your keyboard. These can be found at the top right on a laptop and between the number pad and main keys on a desktop keyboard.

2. Save all open programs using your mouse. Use your mouse to restart your computer. This will only work if your computer isn't frozen. If your mouse doesn't move, press the power button on your Dell until the computer turns off. Press it again to restart. If the issue was lack of memory or a locked program, this will unlock your keyboard. Continue to Step 3 if the keyboard is still locked.

3. Shut down your computer using your mouse or power button. Don't restart. Unplug your Dell.

4. Remove the battery if you're using a laptop by turning the laptop over and sliding the battery release latch. Slide the battery out and replace after one minute.

Have a good one!


  • Step 2 Save all open programs using your mouse. Use your mouse to restart your computer. This will only work if your computer isn't frozen. If your mouse doesn't move, press the power button on your Dell until the computer turns off. Press it again to restart. If the issue was lack of memory or a locked program, this will unlock your keyboard. Continue to Step 3 if the keyboard is still locked.
  • Step 3 Shut down your computer using your mouse or power button. Don't restart. Unplug your Dell.
  • Step 4 Remove the battery if you're using a laptop by turning the laptop over and sliding the battery release latch. Slide the battery out and replace after one minute.

  • Read more: How to Unlock a Dell Keyboard | eHow.com http://www.ehow.com/how_5063232_unlock-dell-keyboard.html#ixzz0uguUk4bZ

    Jul 25, 2010 | Dell Latitude D600 Notebook

    1 Answer

    The keyboard is locked


    Dear Sir,

    plz folow this step to unlock keyboard

    1. Step 1 Check to be sure your "Number Lock" or "Function Lock" keys aren't lit. These can lock out certain parts of your keyboard. If either of these is lit, press them to unlock the locked portion of your keyboard. These can be found at the top right on a laptop and between the number pad and main keys on a desktop keyboard.
    2. Step 2 Save all open programs using your mouse. Use your mouse to restart your computer. This will only work if your computer isn't frozen. If your mouse doesn't move, press the power button on your Dell until the computer turns off. Press it again to restart. If the issue was lack of memory or a locked program, this will unlock your keyboard. Continue to Step 3 if the keyboard is still locked.
    3. Step 3 Shut down your computer using your mouse or power button. Don't restart. Unplug your Dell.
    4. Step 4 Remove the battery if you're using a laptop by turning the laptop over and sliding the battery release latch. Slide the battery out and replace after one minute.
      For desktops, disconnect the keyboard from the desktop. Reconnect after one or two minutes.
    5. Step 5 Reconnect the power adapter or AC cord. Start your computer.
    6. Step 6 If your keyboard is still locked on a Dell desktop, disconnect the keyboard. Restart your computer and reconnect the keyboard after the system boots. Allow your operating system to recognize and reinstall the keyboard.
    Thanks For Your Time,

    Apr 13, 2010 | Dell adamo PC Notebook

    1 Answer

    Dell keyboard locked up


    Dear Sir,

    PLzz folow this step to unlock your keyboard

    Step 1 Check to be sure your "Number Lock" or "Function Lock" keys aren't lit. These can lock out certain parts of your keyboard. If either of these is lit, press them to unlock the locked portion of your keyboard. These can be found at the top right on a laptop and between the number pad and main keys on a desktop keyboard.
  • Step 2 Save all open programs using your mouse. Use your mouse to restart your computer. This will only work if your computer isn't frozen. If your mouse doesn't move, press the power button on your Dell until the computer turns off. Press it again to restart. If the issue was lack of memory or a locked program, this will unlock your keyboard. Continue to Step 3 if the keyboard is still locked.
  • Step 3 Shut down your computer using your mouse or power button. Don't restart. Unplug your Dell.
  • Step 4 Remove the battery if you're using a laptop by turning the laptop over and sliding the battery release latch. Slide the battery out and replace after one minute.
    For desktops, disconnect the keyboard from the desktop. Reconnect after one or two minutes.
  • Step 5 Reconnect the power adapter or AC cord. Start your computer.
  • Step 6 If your keyboard is still locked on a Dell desktop, disconnect the keyboard. Restart your computer and reconnect the keyboard after the system boots. Allow your operating system to recognize and reinstall the keyboard


  • Thanks For Your Time.

    Apr 10, 2010 | Dell 0Y3740 Keyboard

    1 Answer

    Keyboard and mouse not working whenever restarts my system


    You may want to try your last good configuration... Reboot your computer and hit F8 during the startup to get to that option.
    If that doesn't work... try unpluging your mouse and keyboard from your tower and restarting the computer. Once it restarts then plug your mouse and keyboard back in to see if XP finds them.

    Jan 24, 2010 | Microsoft Windows XP Professional

    1 Answer

    No start up - constant fan - no mouse or keyboard working


    Update drivers for the mouse and keyboard. I also recommend installing "Glary Utilities" which is a free registry optimezer and corrects and registry errors in the system

    Jun 30, 2009 | Computers & Internet

    1 Answer

    The mouse do not work after I restart my computer


    check battery. press reset button both usb and mouse.

    May 31, 2009 | Gear Head Wireless Optical Tilt Wheel...

    1 Answer

    Keyboard and Mouse don't work anymore


    Hi, Sorry you are having problems,
    Well Marcelo, the first thing to do in a situation like this is to restart your Mac or even better, shut down and restart. So, if you have done this, and still the keyboard and mouse don't respond, and, as you have mentioned, you have tried the other USB ports on the back of the Mac, it sounds like somehow, unexpectedly, your iMac motherboard got a shock of some kind and it killed the USB controller....
    Last thing to try is to unplug the iMac completely of everything and let it sit for 10 minutes and then plug just the keyboard and mouse back in and try to see if that does the trick..
    Otherwise, Apple will cover this if it is still under warranty.
    Good Luck.

    Jan 12, 2009 | Apple iMac 24" Desktop

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