power windows,94 blazer,tahoe

I have a problem with 3 out of 4 power windows on my 94 s-10 blazer.the drivers side works okay,front pass. window not at all.the 2 back windows work,but very slowly.Does anyone have any suggestions on where to begin trouble-shooting.Switches?,motor?I haven't a clue
thanks

so the passenger front window will not work from the driver's control panel and its own windows switch?