I got a 8300 HD DVR on Ebay, thinking it would work on my Time Warner Cable, as it is identical to the box I got from the cable company. It will power up, but won't activate. The box says Cablevision on it. Any way to activate it for Time Warner, or should I put it back on Ebay? Also, if I see a box that says it will work on Time Warner, should I believe it? Thanks!