I have a toshiba satellite A 75 notebook. It has a huge overheating problem so i disassembled it in an attempt to clean the fans and the heatsink. When i re assembled it i tested it and everything seems to turn on except i cant see anything on the screen. It stays completely dark. Every once in a while it beeps but thats all i get out of it. There is a black and white cord that connect to the monitor and i may have mixed up the two ports and plugged them in backwards but i tried the other way to and it still doesnt work.