Recently I bought a set of 2nd hand Elinchrom classic 3000 power pack, with 2 flashhead, but encountered a lot problem. Because the seller did not give me the synchronize cord, so I bought one from Cathay yesterday. the cord is connected to the Amphenol port on the pack and camera X port on camera, but the power pack failed to be connected. I measured the cord with my multimeter, it seems that the cord is okey. I tried to synchronize the power pack with my light meter using the same cord, the power pack was not synchronized again, therefore I guess maybe the synchronize problem is caused by the power pack, or the setting of the power pack. Any one have experience of using this power pack, please kindly give me some advice.