Celestial HD Digital Television Receiver DVB8800HD

Normally, there are 2 ways to hook these devices up. One is the component cable that has 3 colors, red white and yellow. these color codes match an aux. input on the TV (or vid1 or vid2) You need to change the TV input to whichever you used by the remote or maybe under Ch2 (4,3,2,vid2, vid1, aux,111,110,etc) The other way is to use the round 4-5 pin S-video instead of the yellow jack, that is self explanetory. The 3rd way and this depends on your TV and receiver is to use the HDMI, composite or DVI cable connection. These are only for Hi def players and will be either a large multi-pinned computer type plug, 5 colored/lead "octopus" cable, or a smaller D shaped high density cable with the row of contacts inside the plug. In any case you need to tell the TV which input you are using.
Once you get the TV to show a picture of the receiver, then you autoprogram the receiver with the remote under setup or other menu.

Bought a dvb8800hd celestial hd set top box in March 2008. Last couple of months occassionally have no sound. Now sound hasn't been working for last couple of weeks. Can you help? Is it something that can be fixed, loose connection somewhere? Or should I just go out & buy a new set top box?

Thanks!