Thanks for your advice Bittmann. However I can't seem to connect wirelessly either and also I've checked that both the MS Windows and McAfee firewalls are off.
However, let's go over the full factory reset operation again. I power up the unit and it goes through the LED boot sequence and, at the end, the two far right LEDs are on. Following the advice of the Pinnacle FAQ, I leave the unit for 4 minutes in total - even though the boot up only lasts for about 52 seconds I then put the toothpick into the reset hole and - holding it there - I wait until all the lights are lit up at once and stay lit, then they turn off (apart from the extreme far right one) and the reboot sequence starts over again. At the end of this, with the two far right-hand LEDs lit, I remove the toothpick. Now this is where I'm slightly confused: According to my interpretation of the official FAQ, after about one minute the PCTV To Go should automatically start another reboot. If that's the case, it's just not happening with my unit.