🚀 go-pugleaf

paul@intra.demon.co.uk (Paul) wrote:

>My brother's PC has developed a keyboard error.
>I recently fitted a new hard disk to his PC and used my keyboard and
>monitor to configure his system ( to save him lugging his monitor and
>keyboard to my house).
> It initially behaved rather strange, as I needed to press the reset
>button on the PC before the monitor would display anything.
>After a few days this oddity disappeared and the monitor displayed the
>boot up details from power up without a reset.
>However when my brother attached his keyboard and monitor the boot up
>sequence checked the memory then gave "error keyboard not connected,
>press F1 to continue". Since the keyboard was not operating I could not
>press F1 (catch 22).
>Tried bruv's keyboard in my PC - no problem.
>Tried my keyboard in bruv's PC (as used to configure his hard disk) and
>this time the screen would not display anything, even with a reset.
>Fitted my HDD controller card and Video card in bruv's PC but still gave
>same symptons i.e. no display if using my keyboard and keyboard error
>using bruv's keyboard.
>Note with no display the system still stalls presumable at keyboard
>error.
>Keyboard error is immediate after memory check. No Post beeps of any
>kind and Dos not started.
>I have reset the CMOS settings (with the motherboard jumper) to try and
>get the bios to "halt on no errors" which I believe is the default CMOS
>settings. This then allows the keyboard error to be displayed and the
>next POST check to be carried out. The next POST check is the CMOS
>settings, which now needs resetting to the correct hard disk settings
>etc. Again catch 22 as the keyboard will not operate I can't reset the
>CMOS.

>Any ideas ?

As suggested by a few people it could be a damaged keyboard connection.
Visually it looks ok, but I unsoldered it and fitted another connector
(although my soldering leaves a lot to be desired).
I still got the same results.
I have a multimeter to check the connector but do not know what I should
be checking. The connector is six pin as follows:


           1          2
         3              4
 
 
           5        6
- - - - - - - - - - - - - - - - - -edge of motherboard- - - - - - - - - 

Any ideas what I should check, powered up (or not), voltage, resistance
etc ?


TIA
Paul

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