Read, highlight, and take notes, across web, tablet, and phone.Go to Google Play Now »Apple Training Series: Mac OS X Support Essentials v10.6: A Guide to Supporting and Troubleshooting Mac OS Later BIOSes used a sequence of beeps from the motherboard-attached loudspeaker (if present and working) to signal error codes. In the event of an error, but not a fatal hardware error, they display the same screen as seen when holding ⌘ Command+⌥ Option+O+F at startup but with the error message New World Macs (1998–1999) When Apple introduced the iMac in 1998, it was a radical departure from other Macs of the time.
To prevent the system from doing this, try resetting the PRAM.Loading the kernel If none of these errors occur, you will then see a spinning wheel appear below the gray Apple Desktop After your Mac is finished starting up and you're logged in, you see your desktop picture and the Dock. This ensures that it and all processes launched under it are restricted from accessing critical system files or those in other user accounts.When the second launchd process initializes, the system will The actual numeric codes for the possible stages and error conditions differ from one BIOS supplier to another. https://support.apple.com/en-us/HT204156
If a question mark appears after you install a software update,re-select your startup diskusing OS X Recovery. Other screens you might seeYou might see one of these screens appear during startup if you've changed your startup options, or there's an issue starting up your Mac. Information on numeric and beep codes is available from manufacturers of BIOSes and motherboards. There may be a server on your network that your Mac is trying to start from.
Apple logo When you see the Apple logo appear, it means that the computer has found the startup file "boot.efi" on your startup disk. Screenshot by Topher Kessler Up until this point the system has been loading in "kernel space," but once the kernel has loaded all the drivers it needs, then the system needs Copyright © Apple Inc. Macbook Error Codes Text is available under the Creative Commons Attribution-ShareAlike License; additional terms may apply.
Folder with a question mark If you see a folder with a question mark appear instead of the Apple logo, it means your Mac couldn't find a local or network-based startup This process of rebuilding the caches may take a while, so you may see the gray wheel spin a little longer than usual during this time. It can also be a desktop picture. If you've added memory to your Mac, check to make sure it's installed properly.
Covers updated system utilities and new features of OS X Mavericks, including iCloud Keychain and Tags. Mac Stuck On Grey Screen Step 6 - Performs checksum test on ROMs. To do this, immediately press and hold the Shift key after clicking the log-in button at the log-in window. White (Louisville, KY) has been an Apple Certified Trainer since 2000 and is a regular presenter at industry events.
Macs made prior to 1987 crashed silently with the hexadecimal string and a Sad Mac icon. http://www.ernieflores.net/osx/intel-based-mac-startup-sequence-and-error-codes-symbols/?word=black Comments? Prohibitory Sign Mac There are websites which collect codes for many BIOSes. Original IBM POST beep codes Beeps Meaning 1 short beep Normal POST – system is OK 2 short beeps POST error – Mac Logo Makeup On the screen, if working, will be the Sad Mac icon, along with two hexadecimal strings, which can be used to identify the problem.
In addition, on some models, the power LED would flash in cadence. Arek provides consulting, troubleshooting, and integration services for customers that use iOS devices and Macs in complicated environments.Ben Greisler (Exton, PA) is the owner and technical lead of Kadimac Corp., a As the PC platform evolved into more of a commodity consumer device, the mainframe- and minicomputer-inspired high-reliability features such as parity memory and the thorough memory test in every POST were If the memory fails the POST test again, try memory that has been verified to work correctly on another system (i.e., "known-good") or order new memory from the Apple Store. Prohibitory Symbol Mac Fix
In these cases, logging into the system may be a frustrating experience that always ends in a problem or two. Mac Prohibitory Sign El Capitan If you don't see an image appear on your screen after a few moments, try turning up your display's brightness. If you have your system set to automatically log in, once you see the spinning gear under the Apple menu, then press and hold the Shift key.
See all questions on this article See all questions I have asked Still need help? Linux, use port 80 for I/O timing operations. If you still see a question mark after waiting a few moments,use Startup Managerto start up your Mac, then re-select your startup diskfrom System Preferences. Macbook Pro Stuck On Loading Screen If an error occurs, the system halts.
The system directory that contains user account information is referenced and accounts details such as usernames and icons are loaded into the log-in window. In this case, the computer will display a gray screen, sound three tones and blink the power LED on the front of the computer three times, pause, and repeat the blinking If you didn't mean for your Mac to start this way, press and hold the power key to turn off your Mac. At this point you know the system hardware has checked out, and the system is ready to boot.The firmware's next step is to load variables that are stored in the system's
Whether you're a...https://books.google.com/books/about/Apple_Training_Series.html?id=iAwgbkQeZYQC&utm_source=gb-gplus-shareApple Training SeriesMy libraryHelpAdvanced Book SearchGet print bookNo eBook availablePeachpit PressAmazon.comBarnes&Noble.comBooks-A-MillionIndieBoundFind in a libraryAll sellers»Get Textbooks on Google PlayRent and save from the world's largest eBookstore. These commands are passed to the system kernel, which then boots the system in different ways based on the command being given (such as Safe Mode and Verbose Mode mentioned earlier).At Powered By: Cookies help us deliver our services. The original IBM PC could be equipped with as little as 16 KiB of RAM and typically had between 64 and 640 KiB; depending on the amount of equipped memory, the
Do not do this before the spinning gear shows, or you will command the system to boot to Safe Mode instead of Safe Login.Questions? This design by IBM was modeled after their larger (e.g. Two POST seven-segment displays integrated on a computer motherboard The original IBM BIOS made POST diagnostic information available by outputting a number to I/O port 80 (a screen display was not For any other issues besides these errors and symbols, and you're still having problems starting up your Mac, please refer to http://support.apple.com/kb/TS1411?viewlocale=en_US Error/Symbols on Start-up Startup Sequence stage Event Power On
Last Modified: Aug 13, 2015 Helpful? Covers updated system utilities and new features of OS X Yosemite. Last Modified: Mar 16, 2016 Helpful? White,Gordon DavissonNo preview available - 2015OS X Support Essentials 10.9: Supporting and Troubleshooting OS X MavericksKevin M.
If you cannot boot even in Safe Mode, then try doing the same in Single User mode by restarting with the Command-S keys held down. Some possible reasons for this would be that filesystem errors might prevent reading from the hard drive, a hardware conflict might be causing a hang, or a power management error might Lesson files and bonus material available for download-including lesson review questions summarizing what you've learned to prepare you for the Apple certification exam. What people are saying-Write a reviewWe haven't
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