I have a g27 wheel...i have verified my wheel,my optical enconder and g27 and all motors are ok...my pedals,shifter and all buttons are working properly...Do u have a ideea what s the problem?The wheel don t calibrate when i start the pc and don t work anyway....but butons and all are working...maybe be the power adaptor? I had lucky one time to calibrate properly but when i restart the windows this has stopped working..(I kept putting and unplugging it and it started to turn)...the power adaptor i think it it..the green light from the shifter is on 50% and must be 100% when calibrate....i don t know why all working..maybe it doesn t have enough power i think..i don know Say me one ideea if u want.Thank you so much!