Laptop Keyboard Not Working

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I have a year old Dell Inspiron N5030 laptop with Windows 7 and my hard-drive went bad. I purchased a new one, put the new one in, installed windows 7 and everything seemed to be working. I updated with windows updates, just finished and my keyboard and touchpad are no longer working. I did some searching online and one forum suggested the keyboard and touchpad cables came loose while putting in the new hard drive. I opened the laptop again, but no cables seem to be loose. Is this a hardware problem, software, windows update or what?

Any idea?

Please help.

Thanks!

I didn't find the right solution from the Internet.

References en.community.dell.com/support-forums/laptop/f/3518/t/19452012

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