hi. i have a laptop hp g61. i opened the cases and cleaned the cpu fan becasuse it was over heating. i also cleaned the cpu and other parts of the laptop. i closed the cases and puting all the accessories to their original places. i plugged in all the cables in their own places. and after i finished it i tried to turn it on. after i press the button to turn it on the power button light + wireless's button light+ light of the motheboard is turned on for 2 seconds and then they all turn off. the computer is not turning on. i opened it again to check if i made a mistake with cables but i didn't detect any mistake.
what should be the problem ?