Hi
for some reason or other the keyboard of my laptop suddenly stopped working. I mean none of the keys work. External USB keyboard works fine.
Contacted HP and they suggested replacing the onboard keyboard, which I did. But this made no difference. So according to hp if replacing the keyboard fails than it has to be the system board. I replaced the system and again keyboard still failed to respond. Thinking that perhaps it might be a DOA replacement system board I returned it to hp and got yet another board.
I installed this second "new" board and hey presto the keyboard worked, but only for half an hour. Then gradually I started to lose sections of the keyboard and within 2 hours the keyboard stopped working completely. HP don't have any more answers.

Anybody any other suggestions. Apart from buy a new laptop 'cause they are dirt cheap these days. I mean I don't want to get rid of this one as I am too comfortable with it.

Thanks for any help.

What shows up in Device Manager? any yellow "!" or "?" ?

Try removing the Keyboard in DM, then reboot.
Windows should redetect and reinstall hardware & software.

Check KB plug for loose or bent connectors.

What about excess heat buildup? ??

There is nothing to learn from someone who already agrees with you.

Is the PSU and battery good?

Hi
Thanks for your responses

To answer your questions
dumbob - in device manager all working OK
I have in fact reinstalled the OS and the drivers from the original HP backup. made no difference. I know the keyboard itself is ok as I tested it at work on a similar model (same part number) and works a treat.

Razor23 - PSU and battery both relatively new.

I tend not to look at the internals of laptops, so ignore this if its irrelevant, but have you tried a different keyboard ribbon cable?