Hi there, please help! My Air doesn't respond to the power button. No boot up chime or anything on screen. Appears to charge okay. I've tried resetting the SMC with no luck. Had this issue for a couple of days now and I eventually got it to turn on yesterday by pressing the power button over and over in frustration but I'm having no luck with that this time. Thought the power button may be faulty but when I reset the SMC, the MagSafe charger responds every time and instantly. Nearest Mac store is a long drive away and don't want to risk it with somewhere unauthorised. 1 month out of warranty! Gah! AFAIK it's running the latest macOS beta. Thanks in advance!