touching trackpad screen freezes looks encrypted.

I bought and replaced the keyboard but when I turned it on and it loaded, I touched the trackpad the screen has lines and looks encrypted then freezes.

I have checked all part numbers and all match. Checked and followed advice of others who have given their opinions, such as spills or dropped none of which have happened. Only thing that I noticed was a CD was in the player when opened from sleep and clicking.

Question? Does the trackpad need to be replaced? Or is there another issue. Is it an easy item to replace.??