hi,i just got a tv tuner today,my first one. it is a wintv hauppage 878 PCI, i put it in my compter and installed the correct drivers from their website,but i never get any picture,its only a black screen and no audio ,i hooked everything up right and installed the proper driver,i dont know what im doing wrong and its driving me nuts,can soemone please help me out here and tell me what to do. thank you.