3027 Views 1 Reply Latest reply: Jul 29, 2009 12:16 PM by Lyssa
It sounds to me like either the LCD backlight is dying or the inverter cable has a short. Do you have the cable to connect the computer to an external monitor? If so, try that to see if the dimming still occurs. If it does, I think you're looking at a GPU failure, which often means a new logic board is in order.