interesting what you say about the blue, as there isnt even a freeview interface coming up on the telly, i,e freeview menu or if you go on the channel list it says none available (press ok to start auto tune)
You won't get the TV guide/station list until the TV is tuned.
I think your problem is with the indoor aerial, not the TV.
For DTTV a high gain, external aerial is preferable to an indoor aerial. That beng said have the aerial as close to the window as you can get it and, if possible, when tuning have the window open.
If it's an amplified aerial you also need to make sure it is plugged in and switched on.