Hi Les,
Are you absolutely sure that the SB2 is not working? ....I'll explain....
When I got my SB2 a year ago, I powered it up (not yet connected to the hifi system) and nothing appeared on the display. Nothing happened when I used the remote UNTIL I hit one of the buttons on the bottom row (think it was the 'Size' button). The unit would keep going into sleep mode (blank display) every 30 seconds or so until I hit this button again on the remote. Once I went through the network setup and the SB2 recognised the wireless router, all was well.
Also, I have noticed that if you power off the SB2 power supply for a minute (eg. to change interconnects) then turn it back on, nothing appears on the display even if you do hit the 'Size' button on the remote control. However, if you power off the SB2 power supply and leave it off for 10 minutes before turning it back on, it will fire up OK.
Hope this helps.