Hi, need some help with a second hand projector i just bought. It's an ex demo Infocus LP740, it did'nt cost me very much money but i'm just wondering if i can improve the performance without spending shed loads of cash on it??? The problem is that below and above the picture projected, the border is purple, this is also evident on darker scenes on the image which is projected, say a night scene in a film where instead of being black it is slightly purple???? Any ideas what the problem might be?? thanks Rich.