OK. I've been doing searches and reading through these threads for several days and can't figure what the next step would be. A friend of a friend has an 05 Roadster that won't crank. He replaced the RCM, checked fuses, connectors and harnesses. I'm not sure what else. When I heard about the problem I said "It's the RCM'. I brought my 05 Coupe to his shop and had him pull my RCM (since we know it works) and put it in the no start car. It cranked like 1/2 a crank and then nothing. We put his RCM in my car and my car started fine. So we though, might be the PCM then. Same thing. We put my PCM in his car, it cranked 1/2 a crank and then nothing. Put his PCM in my car and it starts fine. So, at this point we know his RCM and PCM are good since they both worked fine in my car. The battery and starter both test good as well. Any ideas on what to look at from here?