I had same problem and have just returned mine to Tesco. They dont have the 160gb in stock, have had to pay extra for the 250gb box. The box is ugly and black and square, not like the rounded edge silver flash unit I took back, hey ho! but need a recordable freeview, and dont want to use SKY!!
Looking in new manual it does give some instructions on rebooting the system when your DTR fails to respond, the 2 scenarios which maybe worth having ago with are as follows:
scenario A - continuously flashing red LED. The following sequence may restore the box to factory settings without losing any saved programmes.
Turn off your box at the mains or unplug,
Wait 5 seconds,
Turn the box back on at the mains or plug in WHILE pressing and holding the front panel power on button for 10 seconds. (all LED lights should come on for 3 seconds).
Wait 45 seconds for the box to complete the reset. See if this works!
IF NOT TRY
Scenario B - Which will lose all saved recordings.
Do the same procedure as above, but instead of pressing power on on the front panel press the menu button on the front panel for 10 seconds.
Hope this may help.
JLeddy, May 2009