Hello,
I am setting up a friend's TiVo at the moment and can't get the thing to change channels.

It is a Philips HDR-312 with Philips OzTiVo 1.4 Image. The STB we are using is a TEAC DV-B420.

When we go to change channels through the TiVo, it goes to the black channel changing screen and never comes back. Also, it is not emitting the IR commands to the box as the light on the front does not flash during a TiVo channel change attempt.

Could someone tell me what possibly might be the problem?

Many thanks.