I have problem with a particular pc not being able to sync at 1GB. By sync I mean the connection status when I check it within windows says 100mb not 1GB. It must be something wrong with the cable because it works on a different ethernet socket. So I was wondering how much would a tester cost? Can you recommend a decent one I can use to find out what the heck is wrong? How can I test if it's the cable itself i.e. maybe one of the conductors is snapped in the middle of the cable?