Yep, eBay sure is a monster when it comes to that type of thing. Always read the fine print (and even then, sometimes it doesn't say anything about the problems).
I'd try opening it up if possible using the proper tools (the right types of screwdrivers are hard to find sometimes). However, this would substantially weaken the system, considering it'll have lost it's facory seal. Make sure that everything is connected properly, and if possible, try to switch Port 1 with Port 4, and see if that helps.