Netbook keyboard keys not working

Hi All,
I have just replaced a screen in an Acer Aspire One Happy Netbook (AOHappy) and after i restarted the machine everything appeared to be ok, i downloaded and installed some windows updates, did some moving about from folder to folder etc, everything was ok. But now my daughter tells me some of the keys are not working,seems to be all on the right hand side of the board, the dots arrows, letters and some synbols. what would be the problem here?
Would the ribbon cable have moved? Or if it were not fully home would that cause these symptoms?

I did remove the keyboard at one point while trying to figure out how to get at the screen.

Thank you.