i have in the set up menu selected AV as my power on preference but when i turn on the tv it starts at the dvb freeview screen . anyone have any idea why?. i dont have freeview at the moment as no arial connected. i power down all devices every night. when i go back to menu it still shows av option chosen and i have tried powering up av source 1st [sky+,pani blue-ray, pani sourrond centre.] please help.