I can’t restart my mini!

Mac Format - - APPLE TALK -

I have a Late 2012 Mac mini which I use as a file server, run­ning the lat­est ver­sion of Yosemite. When­ever it needs to be restarted, either man­u­ally or due to a soft­ware up­date, it pro­ceeds nor­mally to the startup chime, and then I just get a grey screen. Wait­ing for a few hours made no dif­fer­ence.

I added an SSD as an ex­ter­nal boot disk, which af­forded me the op­por­tu­nity to re­in­stall OS X. How­ever, af­ter once com­plet­ing a ‘nor­mal restart’, the prob­lem re­turned. The only work­around I have is to hold the power but­ton to force a shut­down when I have the grey screen and then power up again. Could this be a hard­ware prob­lem? James Hale Prob­a­bly not, but there’s an easy way to check. Do a forced shut down and restart with D held down. This will boot into the hard­ware di­ag­nos­tic mode to run some ba­sic tests on your RAM, disk and mother­board. If that comes up clean, try boot­ing in Safe Mode by hold­ing ß. If this boots, it in­di­cates to you that the fault is in some driver or ker­nel ex­ten­sion. You can find out which one by boot­ing yet again, but this time in Ver­bose mode by hold­ing ç+v. This will dump a mes­sage on the screen for each step in the boot process, and the last one you see be­fore it locks up is the one re­spon­si­ble for the trou­ble. Hope­fully you can use this in­for­ma­tion to roll back an up­date or unin­stall some­thing to get your Mac mini back on track.

Boot­ing in di­ag­nos­tic mode is an easy way to check your Mac’s

ba­sic func­tions are okay.

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