Thanks to everybody for the answers.... but I believe you guys didn't get the point. I am using HDMU since the beggining of march, and I always do the centering as arci suggested, but in this firmware the image is out of center even if I do try with that procedure, and this means that something is wrong with the firmware. It never happens before with the other firmwares.
I love to use HDMU, I believe also that is a great image, but sometimes (it could happen) something could be missing, but if you think my post is not important... well I will think better next time before posting.
By the way, I don't use overscanning, and the settings on HDMU are 16:9 like I always do.