Recently I have encountered a problem when trying to start my SC300 - I turn over the key and the solenoid clicks (once) but the engine does not turn over. After several more attempts (and single clicks), the engine turns over and starts OK. I took it into Sears today (has a Die Hard battery) and the battery and electrical circuit tests out OK. Several hours after I got home, I tried to start it again with the same results (did not start; single click of solenoid). Anyone have any suggestions to this frustrating problem??!!