Originally it has Celeron B815 (1,60 GHz, 2 MB) cpu and i upgraded to i5-3230M (3,20 GHz, 3 MB). First everything seems work normal, i upgraded to latest bios P05RAJ, but the notebook started to shut down randomly, i renewed the thermal compound, i am controlling the cpu heat and it is not near to shut down temperature, as i know the motherboard is compatible with this cpu and higher, i tried the bios before this one too P04RAJ, what can be the problem?