Last august i wrote a detailed article about the different ways to reset a users password, however the instructions i gave for changing the password in single user mode dont always seem to work, especially in leopard. Applejack bundles memtest, an excellent memory tester. Apple has also removed the more thorough boottime diagnostic app on newer macs. Whenever i get a new stick of ram for my mac or pc, im always eager to just.
Applejack is a troubleshooting utility for mac os x. Applejack a utility for use in single user mode mac os x. Sadly, memory modules can sometimes go bad, causing your mac to display. If youre an advanced user who is comfortable with unix, you can use singleuser mode or verbose mode to help isolate issues related to startup. So machines earlier than 2006 definitely wont work. Applejack a utility for use in single user mode mac os x hints. Having the right diagnostic, repair, and data recovery tools can make all the difference for recovering your data and for diagnosing or resolving issues. Have you ever tested your ram using memtest86 from a. Get in touch with your friendly local apple store or applecertified reseller. Start up your mac in singleuser mode or verbose mode apple. Applejack is an easy choice for advanced mac users who are not afraid of the single user mode and commandline interfaces. However when i do this the mini just boots normally.
For whatever reason, there are some websites who are charging for the free utility, but you should not need to pay for it because it is free, open source, and there are mac versions available from developers as free downloads. Reset a lost os x account password in single user mode. Apr 18, 2008 on an intel based mac, insert mac os x install disc 1 that came with your mac to your mac, and hold letter d at boot. Applejack a utility for use in single user mode mac os. Memtest is from the broader unix world and it that has been ported to mac os x. I know most of this stuff can be done via command line in singleuser mode, but offhand i cant recall the verbage for any of the operations but permissions repair and running memtest. Initially, i was given a gui for memtest, a thing called remem or a word similar to that, which i was told negated the use for single user. In this mode, nearly all of the installed ram can be tested whereas under the full os, a considerable portion of memory is tied up by os x processes and the quartz window manager.
Now is the era of mac os x, and even though that old openstep patch wont work for os x, apple could still. Applejack single user mode repair utility reader news. Singleuser mode turn on your mac, then immediately press and hold commandr to start up from macos recovery. Thoroughly testing your macs ram an uptodate how to 2016. If you have recently upgraded your mac ram, or if you are experiencing strange system crashes, its a good idea to test your memory modules integrity using a free tool called memtest essentially, memtest is a utility designed to stress test ram for errors. Or maybe boot to singleuser and run something like find devnull to get it doing something and then hope whatever it is goes wrong and you might see the kernel moaning about something onscreen. If a user wishes to determine how long it will take to run a. Unless your mac is exhibiting specific symptoms of bad ram which we also. Once you have installed memtest for mac, launch the terminal and. Single user mode turn on your mac, then immediately press and hold commandr to start up from macos recovery. Why does apple hardware test return 6002d error code. How to test ram under mac os x january 11, 2008 december 10, 2015 collin allen whenever i get a new stick of ram for my mac or pc, im always eager to just plug it in and start using it to its fullest, but having worked on hundreds of computers and encountering dozens of bad memory modules has convinced me that thorough testing is a must. Unfortunately, this test will require you to leave your mac at the apple store, so they can run the test overnight as it can take anywhere from 1 to 4 hours to complete. Most of the methods are free and give you good results.
Get apple hardware test boot mode back on some os x lion macs. To boot into single user mode, reboot you mac and hold commands. How to test ram using mac os x apple inc, computer repair, marketing, os x whenever i get a new stick of ram for my mac or pc, im always eager to just plug it in and start using it to its fullest, but having worked on hundreds of computers and encountering dozens of bad memory modules has convinced me that thorough testing is a must. Read the text you see at the end of booting into singleuser mode, and use that, ie. If youre an advanced user who is comfortable with unix, you can use single user mode or verbose mode to help isolate issues related to. Jun 02, 2001 mac os x single user mode root access codesamurai forward theres always the constant battle between user friendliness and security. Use apple hardware test and other diagnostics to test for. Apples got a ram tester on their hardware test disc, but its great having one built into single user mode via applejack. Advanced mac troubleshooting anything else to try from the. Now is the era of mac os x, and even though that old openstep. Select disk utility from the utilities window, then click continue. It runs under singleuser mode so it can be used even when os x will not boot.
Apple has known about this vulnerability for some time now. I have created a bootable usb thumbdrive with memtest86 and managed to boot from it on my macbook pro late 2009 model flawlessly using refit as. If indeed it is, theres a version of memtest for os x. The advantage of memtest is that you can run it from singleuser mode, a special startup mode accessed by holding down commands at startup that may work even if. Boot in singleuser mode, and mount the drive rwrite. Hit the cant lock issue with the 32 kernel mode, so figured out how to reboot in 64bit kernel mode and single user mode. In addition you can use the apple hardware tests that came. Apples memory test suite runs a minimal diagnostics operating system that just loads the tests, ensuring as little memory is used as possible, whereas memtest will at least require os x to be booted in single user mode. If your system is more recent, you may find that the memory test begins. Memtest os x apple, iphone, mac discussion macrumors. How to repair hard disks with fsck on macos make tech easier.
Apples classic hardware test suite requires you click the test button. Apples got a ram tester on their hardware test disc, but its great having one built. Aug 14, 20 use singleuser mode to solve wonky mac os x issues os x tips by rob lefebvre 9. When you have refit installed and you apply the shortcut to boot in single user mode. Memtest os x theres a good reason why memtest ox x occupies the last place on this list. Turn on your mac, then immediately press and hold commandr to start up from macos recovery. You should run in single user mode before using on a mac so it can test more of the memory. On an intel based mac, insert mac os x install disc 1 that came with your mac to your mac, and hold letter d at boot. Yes, my mac can boot into other modes, like recovery and apples boot manager, but.
Since memory test programs can only test the ram that is available, be sure to run it in as minimal of an operating. Start up your mac in singleuser mode or verbose mode. The mac daddy of apples test suites, this will test your mac in every way apple can. Theyre often used to troubleshoot issues a mac may be experiencing, or to assist in isolating and repairing some common issues that can keep a mac from starting up correctly, or that make it act strangely when its in use. I cant remember how much singleuser mode leaves you with on macos, other than it being annoyingly little last time i had to do it. Mac os x single user mode root access codesamurai forward theres always the constant battle between userfriendliness and security.
A wired keyboard, unless you are using mac os x 10. Its also worth noting that for best results, you should probably run it singleuser mode. Running memtest in singleuser mode maximizes the effectiveness of the memory test. Note that to get access to memtest, youll need to install it when you install applejack. Enter applejack, which runs only in single user mode commands at startup. Just goes to show ya, folks not all ram is created equal. The advantage of memtest is that you can run it from singleuser mode, a special startup mode accessed by holding down commands at startup that may work even if your mac cant successfully. Applejack is a user friendly troubleshooting assistant for mac os x.
Essentially, memtest is a utility designed to stress test ram for errors. Previous versions of mac os x do not support wireless keyboards in single user mode. I know most of this stuff can be done via command line in single user mode, but offhand i cant recall the verbage for any of the operations but permissions repair and running memtest. Applejack single user mode repair utility reader news and. I saw possible reasons other than open firmware password protection for not being able to boot into single user mode. Canon 5d mark iii70d, panasonic aghpx170aghpx250p, canon hv40, sony z7uvx2000pd170. Applejack also provides its own man manual file, accessible by typing man applejack in singleuser mode. The memtest instructions recommend running it in single user mode. One of the most popular memorytesting utilities is memtest, which is free and runs from the terminal commandline. Turkreno incorporated is a website design and apple computer repair. Applejack will repair disks, repair permissions, cleanup cache files, validate preference files, and remove swap files. My macbook pro 2011 wont boot into single user mode.
Sep 04, 2008 applejack also provides its own man manual file, accessible by typing man applejack in single user mode. How to run memtest in single user mode on apple community. Macs are notoriously reliable computers, but even the best computers sometimes have problems. After language selection, use ctrll keyboard combination to get it to loop mode, and select extended test, and let it run at least for a few hours. Once it has finished booting you will see a black screen with white text. Since memory test programs can only test the ram that is available, be sure to run it in as minimal of an operating system as possible. How to verify your macs hardware is working properly the. Note that to get access to memtest, youll need to install it when.
To test it all you will have to boot into single user mode. The ability to boot into single user mode some users may be locked out from single user mode because of corporate it policies and open firmware security locks. Remember, only use this if you have lost the mac os x install dvd. You might think you can run fsck on a nonbooting disk, but youd be wrong. Use singleuser mode to solve wonky mac os x issues os x tips by rob lefebvre 9. In fact, it was the sales girl that urged me to get the crucial memory, since she knew it was good from using it in her mac. Without getting overly technical in the explanation, memtest works by writing random data to the ram, then. Theyre often used to troubleshoot issues a mac may be experiencing or to assist in isolating and repairing some common issues that can keep a mac from starting up correctly, or that make it act strangely when its in use. Sep 24, 2018 if youre an advanced user who is comfortable with unix, you can use single user mode or verbose mode to help isolate issues related to startup. The last time i tested ram i used rember which was a ui for memtest.
Feb 29, 2012 initially, i was given a gui for memtest, a thing called remem or a word similar to that, which i was told negated the use for single user mode boot. You will be presented with a series of alternate options to boot mac os x e. Sep 09, 2008 plus it includes memtest, which i already use from single user mode to check overclocking stability sometimes. Applejack the top five mac hard drive, diagnostic, and.
Thats because its designed specifically for the hardware it runs on and vice versa. In this article, ryan faas identifies and compares the. I booted into single user mode and ran memtest on both sticks before booting into os x, and they passed all tests. To get a mac to boot from usb you need to hold down the alt option key on the mac keyboard while powering on the machine. Memtest will execute in 64bit mode and can test the full amount of ram installed in your system. Now we need to boot the mac into singleuser mode, which is a. Have you ever tested your ram using memtest86 from a bootable. The memory test will take an hour or two to complete and its likely. Yes, my mac can boot into other modes, like recovery and apple s boot manager, but it fails to boot into single user. But running a search for ram on the mac app store will bring up a number of. He has recommended memtest which uses command line terminal to run in single user mode. It was january 2006 when apple started switching from powerpc cpus to intel x86 cpus. Sep 02, 2009 memtest will run just as it does in terminal. It is also possible to use a usb drive prepared on a windows or linux machine or the premade drives we sell to test a mac.
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