HT204063: How to Reset NVRAM on your Mac
Learn about How to Reset NVRAM on your Mac
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Mar 13, 2015 6:53 AM in response to BillP2by my ginger,When you go thru the boot process, the macbook air does a check of things, Memory, startup volume, startup items and a verification of the startup volume among some other things. If it gets stuck and SMC and pram resets have to be done continually. You need to startup in recovery And use the disk utility option to check and repair the startup volume and permissions. If you find problems that disk utility can't repair, then you would have to try and reinstall from the recovery partition. Command R or Option R gets you there. You could also have a startup item that is corrupt or and out dated or incompatible app.