I just picked up a set of two Calumet Travelite 750's that were described as "new", never used. They are not the most current models but they are of recent vintage. The first one fired up quickly and seems to work well. The second one powered up - the green power indicator light on the back lit up. But it never charged and the modeling light would not come on in any mode. I used the same power cord for each light. I checked the fuse which appeared to be in good order. I left it plugged in for a good 15 minutes. I read the manual which is pretty basic and non-contributory. Any advice? Did I get a bum light? Email response from the seller is pending. Thanks.