Sony Bravia 40v5500 red flashing light, 6 times.

[simlock]

Hi, i am a newbie here, and am looking for some help, if anybody can? i have a brand new Sony Bravia 40v5500, it's an old TV now, i bought it and never used it, i took it out the box, plugged in an aerial, and saw it was working, it spent a long time not being used, anyway, this TV was going to be in my room on the wall, but had to decorate first, which i have just got around to doing as i have work commitments, so, my son rings me and said can he use the TV, i said yes, he plugged it in and said it wasn't working, and all we have now is 6 red flashed from the tv, when we switch it on the green light comes first, then it goes to red flashing. any help would be great, thank you