GT, Std transmission 6 gear; after exhaustive battery jump attempts when it wouldn't start, got nary a click; makes no sound when you turn the key, but headlights are bright, inside lights and radio and ac work; guy helping me thinks it's not the battery, which is less than 4 months old; car is sitting in high school parking lot; could a mechanic get it started on site or will it probably need to be towed, and what could be causing it; have had no problems like this in the past; we also checked the starter fuse (main) and it seemed to be ok