I have a 40" Samsung LCD and now have a wall mounting bracket which i am going to attempt to fit this weekend. I have read various guides about looking for the wood joists, however there doesnt seem to be any! i have found a solid point running vertical from a fused spur so presume thats cable tray. The house is only 12 months old. Would there be a different build method used? what should i look out for?? help!!!