Compaq Persario V5000 Keyboard/Touchpad problem

Hi, i recently bought a Compaq Persario V5000 of a friend, the problem with the laptop is, sometimes the touch pad wont work correctly, it moves very erratically or not at all and somtimes the keyboard will completely scramble so all the buttons still work but for example the Caps Lock key would be the letter "F" and the letter "F" will be Return , and other times both the keyboard and touch pad will work completely fine, i thought it could be a BIOS problem so i updated to the latest version and still the problem remains, i have been searching on Google and can't seem to find any info on the problem, has anyone heard of this problem and if so, is there a fix for it? i have taken the laptop apart and made sure that the keyboard and touch pad are connected correctly.

Thanks, Lee

 

Please help!!, any help at all is appreciated.

Thanks in advance,