PS3 Problem - Help Please!

[olife]

hello guys

FIRST GREAT THANKS TO MAC AND GREAT THANKS TO ALL THE GUYS TO HELP ME.
i will follow your tips ,create a new user and hope it will be good...if no i m afraid i must buy an other ps3.
i have 15go of free space in my ps3 system,delete all the not important datas but no results.
other prob when i play online or offline with a game ,my tv screen become all black during 3 or 4 seconds a lot of time during 1 hour and after all become ok again,this prob is bigger in cod mw2 than in the others games and very important online,it happened once in il2.

great thanks again gentlemen