Sounds as if the touch screen membrane is defective, which is a darned nuisance, but not impossible to fix .... if you are confident of dismantling the n30, you can buy a new touch screen membrane from Ebay for about 4 pounds/6 dollars.
It is a very skilful job to remove the old touch membrane from the actual display screen below it, not really for a novice, and all internal components are very delicate, so i suggest you find a tame technician before you buy the new membrane. The touch membrane connects to the motherboard via a tiny flexible 4 or 5 pin membrane ribbon cable, it's a miracle of miniature engineering inside the n30, so do ve very careful if you decide to do it yourself, best of luck!
Acer n30 Pocket...
on Jan 07, 2017