I have a Toshiba Satellite Laptop computer. All of the sudden it stop working it will not turn on. What i have done so far is I put a new charger, I opened up the computer and installed a DC jack which i had to solder, and I also installed a new fan, then I put it back together and it still won't turn on, no lights no where on the computer I don't know what else to do. I was thinking maybe it's the motherboard. Please help me if you can.