Is it the logic board?
A little over a year ago, a small amount of diet Coke was splashed on the left side of the computer. (The lid was closed at the time.) There are no obvious signs of liquid on the inside of the computer but the display doesn't work. There is also no "chime" on start-up. . .I know. . .bad sign. The laptop was functioning (running Lion) just fine as long as it was hooked up to an external monitor. I had decided I could live with it even though I couldn't use it as a laptop. A few months ago, I downloaded a software update and new problems started. It will boot from the Leopard discs that it came with but I can't install anything higher than Leopard. The Snow Leopard update that also came with the computer won't work. I get a message that it can't be installed on the computer.
It still works just fine if I don't try to install any system above Leopard and it is attached to an external monitor. Sadly, some of the programs I want to use require a more current system.
Again, it was running Lion before the software update from Apple crashed it. Are there any possibilities other than the logic board?
Is this a good question?