...third time. ? Release the keys and allow the Mac to start up. If that does not help here is additional support reference from Apple regarding its LCD displays: Apple Support Link: Power Light Flash ...
...keyboard: Command, Option, P, and R. You will need to hold these keys down simultaneously . ? Turn on the computer. ? Press and hold the Command-Option-P-R keys. You must press this key combination ...
...light on the on/off switch flashes once and on the second the monitor loses all power. I wait 10 seconds and switch power back on at wall and after several and sometimes many attempts it comes on ...
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