7 u j m keys not working after 10.8.1 upgrade, late 2008 aluminum Macbook

That's all, these keys do not work after update/upgrade today. They were working fine right before i did the update and are not working now. If I hit the M ket a few times i do get some garbage. Help?

Thanks, but still the same. It boot normally only if there isn't any usb device attach to the computer. I'm using usb mouse instead of bluetooth mouse and it happens not to boot normally like usual.
The technician said it would be okay if any usb devices attach to the computer during the boot apparently it won't boot normally.
Any alternative sir?

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