Hi All I've bought a mid 2014 macbook pro 15", to later get it back and find the backlight isn't working on the keyboard. Its still under apple warranty so I'm trying to take it in there but there booked out for the next week. The keyboard lights up for a sec when it boots up and when you awake it from sleep, but after that nothing. hitting the keys bring up the usual correct icons on the screen. I have tried resetting the SMC, PRAM and reinstalling Yosemite but still no joy. Running a diagnostics reveals no hardware issues. Any ideas of anything else to try?