When it freezes nothing works, no scrol no keyboard, i must restart it. Yesterday after 4 or 5 restarting computer was working 7,5 hour ale no freez. Next time it freeze i will check a safe mode. Ventilation is really ok, i bought full new pc and all is really hight quality, all temperatures are good, i checked. I don't know if does it metter but: My hard disc is full. When frezes also task manager CTRL+ALT+DELATE isn't working.] Btw. What is: 1.manual crush dump ? 2.Selective startup or clean boot ?