so i purchased a gaomon that was used on ebay.(i didnt realize it was used cause it was the same price as a brand new one) when i got set it up to my laptop the gaomon display works but the pen doesnt register. i dont know if perhaps it just isnt compatible with laptops. i dont believe the problem to be with the pen because i bought a brand new in the box pen for it and it doesnt work either. can someone please tell me if they know about the compatibility with laptops? i cant find anything about this online anywhere that ive looked