HP A705w Desktop Wired Keyboard Not Working

April 22, 2011 at 11:45:15
Specs: Windows XP
Hi,
I reinstalled XP in my system and everything was fine. I turned on the system today a few days later and the mouse wouldn't work, neither would the keyboard. So I used a USB mouse and that worked fine, but the keyboard still doesn't work. I removed the plug several times and restarted to no avail. I used 2 other keyboards that I have and again... nothing. Still not working. I made sure Netframe was installed too. I can't even get into safe mode or bios or anything. Please tell me it's not the motherboard!
Oh and in device manager it is not showing. I tried to add it but it didn't work. Help!
Thank you!

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#1
April 22, 2011 at 12:46:20
"I removed the plug several times and restarted to no avail."

PS/2 mice and keyboards are NOT HOT-pluggable. You should NEVER unplug them or plug them in while the computer is running - doing so can damage the mouse or keyboard or the mboard's PS/2 ports's circuits.
Even if you don't damage anything by doing so, usually the PS/2 mouse or keyboard will NOT work until you have Restarted the computer in any case.

It is common for wires inside the cord of a mouse or keyboard to get broken after it has been used a lot, or after the cord has been yanked on at any time, often near where the cord enters the device. If the insulation on the broken wire is intact, the mouse or keyboard MAY work fine when the cord is in certain positions, NOT work fine when it is in other positions.
Try another mouse or keyboard, or try the subject mouse or keyboard with another computer

You can disable the PS/2 mouse in many bioses, but you can't disable a PS/2 keyboard in the bios.
A PS/2 mouse can only use IRQ 12. The bios always has the PS/2 mouse set to Enabled or Auto by default, and the setting for IRQ 12 set to legacy. If the setting for IRQ 12 is set to PNP use, then certain PNP devices such as a network card or USB controllers can use IRQ 12 and in that case it won't be available for a PS/2 mouse.

The PS/2 mouse or keyboard usually must be plugged into the proper PS/2 port - usually it's plastic surrounding the pin holes is colored purple for a keyboard, green for a mouse. (There were a few mboards that had PS/2 ports that were wired up so they supported a mouse or keyboard in either port, and older laptops with one PS/2 port support one or the other at a time, or both if you use a standard PS/2 Y cord).

If you use a gender adapter to adapt the connector on the end of a mouse or keyboard's cord,
- the mouse or keyboard must be a "combo" type that is intended for and wired up to be used with both types of ports
- the gender adapter for a mouse, often colored green, will usually NOT work with a keyboard, and the gender adapter for a keyboard, often colored purple, will usually NOT work with a mouse, because not all connections are wired up within the gender adapter.
- there is probably only one possible internal wiring arrangement for a USB to PS/2 gender adapter, but there are several possible internal wiring arrangements for a Serial to PS/2 gender adapter, so if the adapter did not come with the mouse it may not work.
.........

If you use a USB keyboard with a USB port, Legacy USB or USB keyboard or similar must be enabled in the bios in order for you to be able to access the bios with a USB keyboard.In older bioses that may be disabled by default -in newer bioses that's usually enabled by default. If you can't get into the bios with a USB keyboard,then you need to either access the bios with a PS/2 keyboard and enabled the settings, or if the default is for it to be enabled, clear the Cmos by moving a jumper on the mboard then move it back, or remove the mboard battery and install it again.
.........

I have encountered only one mboard in all my years of fiddling with computers that has damaged PS/2 keyboard port circuits - I have to use a USB keyboard with that mboard - but I have seen several mboards that have the following problem and it COULD cause the keyboard or mouse PS/2 port circuits on the mboard to not work:

Some mboards develop this problem - electrolytic capacitors were installed on them that were not properly made, and they fail eventually - the mboard manufacturer didn't know they were improperly made at the time the mboard was made.

Open up your case and examine the mboard to see if you have bad capacitors, and/or other findable signs of mboard damage .

This was the original bad capacitor problem - has some example pictures.
History of why the exploding capacitors and which mboard makers were affected:
http://members.datafast.net.au/~dft...

What to look for, mboard symptoms, example pictures:
http://www.badcaps.net/pages.php?vid=5
Home page that site
- what the problem is caused by
- he says there are STILL bad capacitors on more recent mboards.
http://www.badcaps.net/

Pictures of blown capacitors, other components, power supplies, fried Athlon cpus, etc.:
http://www.halfdone.com/Personal/Jo...


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#2
April 22, 2011 at 13:31:33
My capactors seem fine and everything else is working fine. I just finished update windows XP 3

The mouse is working but I switched to a USB. Maybe I should try this with the keyboard?

I have no way to get into bios.

The keyboard lights up so I know it's working, besides it works fine on my other systems.

Any other ideas?

Thanks.


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#3
April 22, 2011 at 13:46:57
The settings in the bios do not spontaneously change, at least not unless you change the amount of ram installed or which drives you have installed or their connection or the cpu you have installed, and there is never a setting that can disable a PS/2 keyboard.

Try a USB keyboard - it should work fine while booting and in Windows.

If you use a USB keyboard with a USB port, Legacy USB or USB keyboard or similar must be enabled in the bios in order for you to be able to access the bios with a USB keyboard.In older bioses that may be disabled by default -in newer bioses that's usually enabled by default. If you can't get into the bios with a USB keyboard,then you need to either access the bios with a PS/2 keyboard and enabled the settings, or if the default is for it to be enabled, clear the Cmos by moving a jumper on the mboard then move it back, or remove the mboard battery and install it again.

When you have a generic system, there is usually a detailed description of the settings in the bios Setup in the mboard manual, and often which settings are the defaults are shown.

When you have a brand name system, that info is usually not available, at least not all the details of it.


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