When I got married my wife had an '07 Sportsman 4x4 that she was letting her brother use. When we got it back from him it would not start and seemed to have no power. I can fix the basics like changing the battery etc. A friend of a friend came to help me out. After changing the battery and checking the solenoid he told me he thinks it is the computer that is the problem. He said he would take care of it but it never got fixed. From what I'm reading on here it seems others have had a lot of the same problems and it's either the ECM or the PCM. I would like to do the work myself mostly for money reasons but partly because I want to learn. Can anyone give me a simple break down on how to tell which may be causing the problems. Or is just easier to pay $50 and hour plus parts and tax just to have it fixed by a Polaris dealer?