I suppose... he means that the touchscreen does not respond to touches.
If that is so, you can try navigating (with keyboard, which I presume is functioning) to Settings -> SD card & phone storage -> Factory reset.
That will reset the phone, though I doubt it can help... But worth a try and won't do any harm.
Also, you can try flashing the phone. See sticky threads for that.
But it seems to me, the fault is hardware and you will have to send the phone for repairs.