Late Mac Mini 2013 ,osx Yosemite .It's shows "?" (Question Mark) on the sreen when Start .

Mac Mini Late 2013 .
2.6GHz ,Quad core I7.
1TB (5400-rpm) hard drive.
OSX Yosemite upgrade .
Now It's won't start .The screen shows " ? " ( Question Mark ).
I ran Hardware test :No trouble found .
Memory test : No trouble found .
Please Help !

A flashing question mark or globe appears when you start your Mac - Apple Support

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http://support.apple.com/kb/TS1440
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http://support.apple.com/kb/TS2570
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in response to lllaass
here what I copied from Console:
27/12/2014 02:29:58,457 WindowServer[185]: WSGetSurfaceInWindow : Invalid surface 1336265605 for window 268
27/12/2014 02:30:02,516 WindowServer[185]: WSBindSurface : Invalid surface 1040636110 for window 266
27/12/2014 02:30:17,370 com.apple.xpc.launchd[1]: assertion failed: 14B25: launchd + 160118 [55B9FF23-B298-321A-B776-CF7676586C04]: 0xe
27/12/2014 02:30:17,371 com.apple.xpc.launchd[1]: assertion failed: 14B25: launchd + 160118 [55B9FF23-B298-321A-B776-CF7676586C04]: 0xe
27/12/2014 02:30:18,819 Office365Service[2012]: WARNING: The Gestalt selector gestaltSystemVersion is returning 10.9.1 instead of 10.10.1. Use NSProcessInfo's operatingSystemVersion property to get correct system version number.
Call location:
27/12/2014 02:30:18,819 Office365Service[2012]: 0   CarbonCore                          0x901777e7 ___Gestalt_SystemVersion_block_invoke + 135
27/12/2014 02:30:18,819 Office365Service[2012]: 1   libdispatch.dylib                   0x960dc130 _dispatch_client_callout + 50
27/12/2014 02:30:18,819 Office365Service[2012]: 2   libdispatch.dylib                   0x960dc0b5 dispatch_once_f + 251
27/12/2014 02:30:18,819 Office365Service[2012]: 3   libdispatch.dylib                   0x960dd0d8 dispatch_once + 31
27/12/2014 02:30:18,819 Office365Service[2012]: 4   CarbonCore                          0x90109fb8 _Gestalt_SystemVersion + 1050
27/12/2014 02:30:18,819 Office365Service[2012]: 5   CarbonCore                          0x90109b69 Gestalt + 150
27/12/2014 02:30:18,819 Office365Service[2012]: 6   Office365Service                    0x000589a3 Office365Service + 358819
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27/12/2014 02:30:29,794 warmd[36]: [_bootcachectl_playlist_for_file:3197] Unable to generate playlist for file: 2 No such file or directory
27/12/2014 02:30:29,797 warmd[36]: [_bootcachectl_playlist_for_file:3197] Unable to generate playlist for file: 2 No such file or directory
27/12/2014 02:30:29,797 warmd[36]: [_bootcachectl_playlist_for_file:3197] Unable to generate playlist for file: 2 No such file or directory
27/12/2014 02:30:29,797 warmd[36]: [_bootcachectl_playlist_for_file:3197] Unable to generate playlist for file: 2 No such file or directory
27/12/2014 02:30:29,799 warmd[36]: [_bootcachectl_playlist_for_file:3197] Unable to generate playlist for file: 2 No such file or directory
27/12/2014 02:30:29,801 warmd[36]: [_bootcachectl_playlist_for_file:3197] Unable to generate playlist for file: 2 No such file or directory
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27/12/2014 02:30:30,883 com.apple.xpc.launchd[1]: (com.apple.xscertadmin[2020]) Service exited with abnormal code: 1
27/12/2014 02:30:30,928 coreaudiod[1249]: 2014-12-27 02:30:30.927642 AM [AirPlay] Power: SystemWillSleep
27/12/2014 02:30:30,928 coreaudiod[1249]: 2014-12-27 02:30:30.927798 AM [AirPlay] BTLE client stopping to browse for AirPlay Solo Target Presence.
27/12/2014 02:30:30,928 coreaudiod[1249]: 2014-12-27 02:30:30.928007 AM [AirPlay] BTLE discovery removing all devices
27/12/2014 02:30:30,929 coreaudiod[1249]: 2014-12-27 02:30:30.929458 AM [AirPlay] BTLE client stopped to browse for AirPlay Solo Target Presence.
27/12/2014 02:30:30,931 watchdogd[162]: [watchdog_daemon] @(         pm_callback) - ref=0x0 msg_type=0xe0000280 msg=0x2a0005
27/12/2014 02:30:30,931 watchdogd[162]: [watchdog_daemon] @(    wd_daemon_thread) - events buffer: 65r1069 3634s1069
27/12/2014 02:30:30,965 Office365Service[2012]: System shutdown notification
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27/12/2014 02:30:31,044 imagent[1305]: <IMMacNotificationCenterManager: 0x7fde8a42c1e0>: notification observer: com.apple.FaceTime   notification: __CFNotification 0x7fde8a54a860 {name = _NSDoNotDisturbEnabledNotification}
27/12/2014 02:30:31,089 WindowServer[185]: device_generate_lock_screen_screenshot: authw 0x0(0)[inf, inf, 0, 0] shield 0x7fbf43423ed0(2001), dev [1680,1050]
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27/12/2014 02:30:31,105 WindowServer[185]: device_generate_desktop_screenshot: authw 0x0(0), shield 0x7fbf43423ed0(2001)
27/12/2014 02:30:31,180 apsd[59]: Peer [pid=1203] requested push wake but lacks APSPushWakeEntitlement
27/12/2014 02:30:31,228 imagent[1305]: <IMMacNotificationCenterManager: 0x7fde8a42c1e0>:    NC Disabled: NO
27/12/2014 02:30:31,228 identityservicesd[1311]: <IMMacNotificationCenterManager: 0x7ffac2c4fef0>:    NC Disabled: NO
27/12/2014 02:30:31,237 imagent[1305]: <IMMacNotificationCenterManager: 0x7fde8a42c1e0>:   DND Enabled: YES
27/12/2014 02:30:31,237 identityservicesd[1311]: <IMMacNotificationCenterManager: 0x7ffac2c4fef0>:   DND Enabled: YES
27/12/2014 02:30:31,237 imagent[1305]: <IMMacNotificationCenterManager: 0x7fde8a42c1e0>: Updating enabled: NO   (Topics: (null))
27/12/2014 02:30:31,237 identityservicesd[1311]: <IMMacNotificationCenterManager: 0x7ffac2c4fef0>: Updating enabled: NO   (Topics: (null))
27/12/2014 02:30:31,237 identityservicesd[1311]: <IMMacNotificationCenterManager: 0x7ffac2e30040>: notification observer: com.apple.iChat   notification: __CFNotification 0x7ffac2c43f40 {name = _NSDoNotDisturbEnabledNotification}
27/12/2014 02:30:31,244 identityservicesd[1311]: <IMMacNotificationCenterManager: 0x7ffac2e30040>:    NC Disabled: NO
27/12/2014 02:30:31,249 identityservicesd[1311]: <IMMacNotificationCenterManager: 0x7ffac2e30040>:   DND Enabled: YES
27/12/2014 02:30:31,249 identityservicesd[1311]: <IMMacNotificationCenterManager: 0x7ffac2e30040>: Updating enabled: NO   (Topics: (null))
27/12/2014 02:30:31,000 kernel[0]: PM response took 347 ms (71, blued)
27/12/2014 02:30:49,000 kernel[0]: PM response took 3456 ms (31, powerd)
27/12/2014 02:30:49,000 kernel[0]: Failed to get hibernate image filename
27/12/2014 02:30:49,000 kernel[0]: AirPort_Brcm43xx::powerChange: System Sleep
All that is really chinese for me Do you know where i could get anything to be teached about all that
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Do you have different FT addresses on your Mini, iPhone and iPad?
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Troubleshooting FaceTime http://support.apple.com/kb/TS3367
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http://osxdaily.com/2011/10/18/set-up-imessage-on-iphone-ipad-ipod-touch-with-io s-5/
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http://support.apple.com/kb/TS2755
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Setting Up Multiple iOS Devices for iMessage and Facetime
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FaceTime, Game Center, Messages: Troubleshooting sign in issues
http://support.apple.com/kb/TS3970
Unable to use FaceTime and iMessage with my apple ID
https://discussions.apple.com/thread/4649373?tstart=90
How to Block Someone on FaceTime
http://www.ehow.com/how_10033185_block-someone-facetime.html
My Facetime Doesn't Ring
https://discussions.apple.com/message/19087457
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How to Send SMS from iPad
http://www.iskysoft.com/apple-ipad/send-sms-from-ipad.html
You can check the status of the FaceTime/iMessage servers at this link.
http://www.apple.com/support/systemstatus/
 Cheers, Tom

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As dwb points out switching from Apple to PC equipment is a false economy that lures in administrators. In our county school system we had a superintendent who hired a good friend...who had PC-industry ties. Decided to remove all Apple equipment from the elementary schools and switch to PCs. It wasn't long before they ended up going on a 4-year cycle of "refreshing" the equipment, i.e., completely replacing all hardware in every school on a four year cycle. Since my wife was a Media Specialist, aka librarian, and responsible for technology in her school, every four years she had to develop a complete school map of where each teacher wanted the computers in their classrooms, complicated by where the technicians predetermined the locations of the network wire drops, of course. then teachers get shuffled over the summer and all the plans are for naught.
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I am trying to log onto a Mac Mini I haven't used in awhile and I forgot the password. I am trying to reset the password with my apple ID but the computer keeps saying the Apple ID and the password are incorrect whenever I know they are, as I am using the exact same ID right now.
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If the user account is associated with an Apple ID, and you know the Apple ID password, then maybe the Apple ID can be used to reset your user account password.
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When the OS X Utilities screen appears, select
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Late Mac Mini 2013 ,osx Yosemite .It's shows "?" (Question Mark) on the sreen when Start .

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