Okay, soooo, I took the PS3 to the guarantee repair.
It kinda saddens me, because contrary to what is said on the internet, I didn't have any problems with the Xbox 360, but now I did with the PS3.
Anyway, when I turned it on (a week ago or so), the PS3 started to make a noise like the ventilators were going against something solid.
I procrastinated for a week, until I finally took that mottafawka to repair.

In fact, I took it there yesterday.
It's getting repaired and I will get it back in a week, so I can not play with the PS3.
Anyway, atleast they said they'll replace the whole ventilation system rsmthn, so I guess it was just a manufacturing defect, and let's/I hope that it won't happen again.