Question about Compaq (243890-001) 250-Watt Power Supply

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Power supply I just installed a new power supply from HP and computer turn on but the keyboard and mouse will not function. Have checked both keyboard and mouse connections and they are ok. The light on the optical mouse is on.

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  • chazmatt39 Oct 21, 2008

    keyboard is P2P and mouse is USB. Could I have possibly missed a connection as there are numerous extra plugins on the power supply? I thought I had them all marke but I may have missed one.

  • Canaan Hoffman
    Canaan Hoffman May 11, 2010

    Your drivers could have malfunctioned and are ur mouse and keyboard USB or P2P?

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  • 164 Answers

There wouldn't be anything from the PSU giving power to your keyboard and mouse. The mobo handles that unless your giving your mobo the wrong amount it needs which might be why your P2P and USB arn't working. Although it is odd that your mouse isn't working with P2P as that requires less power.

Posted on Oct 23, 2008

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Posted on Jan 02, 2017

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2 Answers

What to do next


If you installed tha motherboard yourself, check what you've done. If it was dome by someone else, like a technician, he should give you at least aa minimum of warranty.

Jun 06, 2015 | HP Computers & Internet

1 Answer

My computer mouse and keyboard not functioning well. I replace the keyboard but only last a month.


Hi jhunix,

I'm going to need even more information; The devices that use PS2 connections, which device is it, and how many of those devices do you have?

One thing that might be a problem, if the issue you see is intermittent, I would check the PS2 connector and see if the pins are bent or broken. PS2 connector pins sometimes will bend or break and this can cause some connection issues if not completely stop the keyboard/mouse from working... Also given the age of your PC the PS2 port may just be bad, but this is not a fatal injury to a computer.

Replacing the Keyboard and Mouse with a standard USB keyboard and mouse, should resolve all of your issues.

PS2 is an older technology that keyboards and mice used to run on; Now however USB connections are used.

Further more, if this an HP Desktop with 2 USB ports on the front, and 4 USB ports on the back, you will want to avoid using the 2 USB ports on the front, especially on older HP and Dell Desktops, the reason is the power supplies often do not have enough power to run multiple USB devices on the front USB ports.

The back ports should be fine regardless of the number of devices.

Hope this helps.

Dec 10, 2013 | Computers & Internet

2 Answers

The wireless keyboard and mouse are not working.


  • Check to ensure that the wireless receiver is plugged into your computer. Press the "Connect" button on the bottom of the receiver to attempt reconnecting your mouse and keyboard to the computer. If your mouse and keyboard use Bluetooth, ensure that your computer's Bluetooth is active and detects the mouse and keyboard.
  • Check to see if the keyboard and mouse are turned on. If the power indicator lights on the keyboard and mouse are not green, press the "Power" button to turn the keyboard and mouse on.
  • Check the batteries of the mouse and keyboard. If the batteries are dead, replace them with fresh batteries and reconnect the mouse and keyboard to the computer by pressing the "Connect" button on the bottom of the wireless receiver attached to the computer. If your mouse and keyboard use rechargeable batteries, let the batteries recharge before using the device again.
  • Uninstall and reinstall your wireless keyboard and mouse drivers. Sometimes, the Logitech drivers are at fault for a bad connection. Use the Control Panel to uninstall the old drivers, then visit the Logitech website and install the latest drivers for your keyboard and mouse.
  • Search the Logitech Support Database. If your keyboard and mouse are still failing to function properly, visit the Logitech Support website and browse the support page for your product for specific solutions.

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1 Answer

Windows update = dead mouse


Try using a usb mouse and keyboard.Your computer should already have drivers for these devices loaded.

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1 Answer

Keyboard/Mouse not working after power supply replacement


Hello there:
ok first remove both the keyboard and mouse
and restart the computer and see if it says anything about no keyboard or mouse present if so this is good now just turn off the computer and install the mouse first and reboot and see if the mouse is able to work and than do the same for the keyboard. please try these first and please let me know how this goes, there is more that we can do if needed ok please dont forget to rate this for me
best regards mike
(usn retired)

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1 Answer

Keyboard, mouse, screen do not function?


you may have a bad mother board or power supply,however try a few of these,bare bone the system,no mouse keyboard,only monitor,remove all internal cards,power on.If no go remove memory ,power on if you get beep tones the motherboard is good.Question for you did the fan turn during these steps.Do you have a amber light on the power button,if you do the answer is you have a bad power supply.
Good luck

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Keyboard, mouse, front USBs,DVD recorder not working


It sound like your USB Ports is the problem. Go to the Hardware manager delete the USB Ports and then shutdown and power back up.
The system then should reinstall the USB Ports and associated drivers. If not the USB Ports were probably fried by the power outage.

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usb mouse and keyboard depend on ur usb ports and ur bios u should check that ur usb drivers are installed properly or not .n try changing ur keyboard in different usb port . thanks  

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New HP keyboard & Mouse not working


I solved this problem by
1taking off the tower cover

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