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I turn on my mac to a grey screen then the apple logo appears then the log in I put in my password then I see my account pic with a loading bar below it then the screen goes grey shuts off and does the same thing I have have tried safe mode and recovery mode the macOS Sierra. the mac is 17inch

IconDaemon
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Katie Bonnici
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  • We're missing some details here like Mac Model (iMac or Macbook Pro) what version of the OS are you running? Have you tried Verbose Mode (Cmd-V while turning on)? Remember, we're not there to look over your shoulder so the more relevant details the better. – Allan Feb 28 '17 at 22:36
  • The os version is yosimite when I try verbose mode so far the screen appears as it should black with white text then the screen goes conpletely grey – Katie Bonnici Mar 01 '17 at 01:50
  • Couple things to do...while booting in Verbose mode, see if there are any errors that appear; use a cell phone camera to catch everything. Secondly, run Apple Hardware Test (AHT). Hold the D key while booting from a powered off state with the AC adapter connected. – Allan Mar 01 '17 at 12:03
  • I video taped the verbose mode and there was no error them the screen turned grey and when I turn it on holding d the screen turns on grey and stays grey – Katie Bonnici Mar 02 '17 at 23:21
  • I'm not sure what you mean – Katie Bonnici Mar 03 '17 at 00:19
  • Many times the messages that get output before the Mac crashes/reboots/etc. can give a clue as to what's happening. Also did your run AHT? – Allan Mar 03 '17 at 00:35
  • When I got the hardware testing screen up it ran and said there were no problems – Katie Bonnici Mar 03 '17 at 00:35
  • Did you run the extended tests? – Allan Mar 03 '17 at 00:36

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