Vostro keyboard-wrong letters

Hello There.
I've a Vostro 1510 and had to change the motherboard. Everything works fine except the bottom row of keys on the keyboard. The z does nothing and all the rest give the letter immediately to the left. Hit the v
and you get a c, hit the b and you get a v etc. A Usb external kbd works fine.
I bought a new kbd in case the old one was damaged, but the new one gives the same problem. I've updated the bios to the latest version and tried
setting Vista to both US and UK kbd layouts (I'm in the UK). All to no avail.
I'm pretty sure it's not a Vista issue as I booted off an old '98 disc to a dos
prompt and got the same result. The kbd has the long left shift key and no backslash between that and the z. The model number of the old mobo was JAL-4122p. I couldn't find that anywhere so the new one isJAL-4121p. Since the new one fits perfectly and works in all other ways, I don't think that can be the problem, but if it is, surely there must be either a kbd for the new mobo or a bios update to make them compatible. I've searched for both with no luck. I've tried two other forums with no success so show them how it's done.

 

1. Try reseating your keyboard.
2. Your keyboard controller (on the motherboard) has gone wacko.

 

As the poster above mentioned make sure the keyboard cable is properly seated on the motherboard. You can get undesirable results when it's not making proper contact.

 

Thanks Pylon and Rodster. I've tried reseating the keyboard, no joy. I hadn't thought about the kbd controller. It seems a wierd coincidence that this kbd
has 'left shift' then z,x,c etc instead of 'left shift',backslash z,x,c and it's the z key that doesn't work. I'd like to confirm that it's the kbd controller before I take out the board and try to get the seller to send me a new one. Any idea if there is a kbd from another model (with a normal bottom row layout) that would fit the ribbon connector on the board? I don't care that it wouldn't fit
in terms of size, screw holes etc. as I'd gladly spend the cost of a kbd to find out if it is definitely the controller. Thanks for your replies.