I was given a Toshiba Satellite C675- S7200, which wouldn't power on. I did the oven trick with the motherboard just to see if I could get it to power on but that didn't work. I bought a "new" used motherboard that was tested, and that didn't work, and now I've got a brand new board in it. It will power on but no screen. I've resorted to firing the parts cannon at it. Also the screen is new because old one was cracked. Can anyone shed some light on this?