Try:

- Rebooting both units (receiver: Repeatedly press power button, HSX: switch on back).

- Verify old receiver really does work in the spot for the new receiver with same cabling etc.

- Check cabling and network jacks for problems.

- Check network settings on HSX to see if anything is goofy (like only dishing out one address?)

- See if it works plugged straight into the HSX with HPNA wire.