Thanks for the answers.
We did the reassembly right ...
Actualy the problem permished somehow ^^ After i did a total clean of memory i get to the tech mode and i saw that hard disk option was on,i put it off bcz there is no hard ,then at the configuration sheet it wrote that the machine got 0 Mb of memory but it has 98 Mb.Anyway we still don't know what caused this bizarre thing.Mby there is still somewhere software issue but for now we decided to not touch it
