some keyboard buttons not working

[adbp1]

hi, i have my brothers laptop infront of me and some of the buttons arent working, only 2/3 delete and arrow up buttons have stopped working.
have tried to clean out and still not working.

is there any idea why they would stop working and best way to get them back?

laptop is packard bell easy note ng45

thanks ali

 

[adbp1]

ok so in past 20 mins ive taken off keyboard and given a little twist! taken the buttons in question off and cleaned under neath ( havent put back yet ) but still nothing, dont have usb keyboard as im at his house but will try when at home if i cant fix here.

dont think its software related as we done reinstall only few hours ago and it wasnt working before and isnt working now!!