I have a Macbook air that is a total paperweight, not even the power cable (and I've tried a known working one) lights up when plugged in. The power port appears to be clean and without debris. Any suggestions for anything else to try? I'm highly technical, so I've already taken the bottom off, removed the SSD and poked around, but there's not much else you can do inside a 2011 Air. Any suggestions would be greatly appreciated!