Apple Hardware test won't start

Hi,
I have tried pressing 'D' on startup, as well as command+D and command +R on startup and nothing works.
This is a macbook late 2008 model running mountain lion.
Appreciate your time in helping me solve this.

When you get your computer, Apple Hardware Test is stored on the hard disk, but it's deleted when you erase the hard disk or upgrade OS X, so it's no longer in the hard disk.
The DVDs which came with your computer have Apple Hardware Test, so insert the Mac OS X DVD and hold the D key while your computer is starting to start in Apple Hardware Test. See > http://support.apple.com/kb/ht1509

Similar Messages

  • Apple Hardware Test won't start from original Apple DVD

    I'll make this one short and to the point, and here're what I did to try to start the Apple Hardware Test - and failed:
    1) Disconnected all connected network and hardware except the bare essentials (Apple USB keyboard and mouse).
    2) Insert DVD#1 of the original iMac media (then OS X v10.5.2)
    3) Shut off iMac. Start, holding 'D' key (with the iMac DVD#1 in the drive)
    4) Keep holding 'D' key, AHT didn't start, instead the DVD disc ejects, and the grey screen shows folder with question mark, nothing happens thereafter.
    5) Repeated 10x, no difference.
    Somebody knows what's wrong?

    Holding down C key does start the Mac OS X installer; in which I was able to "partially" diagnose that my HDD is toast by using the Disk Utility. It formats (erases), but as soon as I finished erasing, I tried to verify the disk, and it says it already has problems and cannot be repaired.
    I am thinking if during the loading of AHT (from DVD), it tries to cache some files onto the internal hard drive. Since my drive is no good - thus the reason for my using AHT, which is to find out if I get a 4HDD/11 type error - the AHT simply cannot load under my circumstances.

  • Apple Hardware Test won't load

    Hi,
    I'm running OS 10.9.4 on a late 2011 MB Pro and am unable to boot up to the Apple Hardware Test partition. Also won't boot to system install USB flash drive. Any help wold be much appreciated.

    It's option key to boot AHT cd. You can run it, but firmware and OS updates makes the disk veriosn obsolete. So don't panick over a false positive.
    I would backup files and c boot from the installer disk, select Disk Utility and Repair Disk/Permissions see if that works. Also disable hard drive sleep in System Preferences>Energy
    If not repeat above and Erase w/Zero option and reinstall the OS. If your going to bother with all that, might as well make the jump to Tiger and iLife '06 (not included with Tiger)

  • Apple hardware test won't run

    I'm positive my exhaust fan is on it's last leg.  I want to run a hardware test to confirm, but nothing works.  I've shut down and held D on starting, I've held Option + D, I've held Command + D, I've restarted, shut down and started up with all these.  Nothing works.  I have a wired USB keyboard, and I've tried with it directly plugged into the mac.  I'm at my wit's end here!
    20-inch, Early 2008
    Processor  2.66 GHz Intel Core 2 Duo
    Memory  2 GB 800 MHz DDR2 SDRAM
    Graphics  ATI Radeon HD 2600 Pro 256 MB
    Software  OS X 10.9.2 (13C64)

    Hi Amanda Marvin!
    Try running the Apple Hardware Test by using the steps listed in this article about AHT:
    Using Apple Hardware Test
    http://support.apple.com/kb/ht1509
    If necessary, you may need to also try resetting your SMC if you are having difficulty loading the hardware test:
    Intel-based Macs: Resetting the System Management Controller (SMC)
    http://support.apple.com/kb/ht3964
    Thanks for coming to the Apple Support Communities!
    Cheers,
    Braden

  • HT201257 Apple hardware test how to start it?

    I haven't optical drive. So how can I start the Apple hardware test without optical drive? I have a 15 inch mid 2010 macbook pro.
    I have the problem sometimes my display under osx or under windows 7 professional stay black I can't do anything and can only restart the laptop via powerbutton.
    error log from Mac:
    Interval Since Last Panic Report:  6831 sec
    Panics Since Last Report:          2
    Anonymous UUID:                    F0F6EAE0-8738-4D83-AB4D-0693D0A4E800
    Thu Aug 30 13:56:16 2012
    panic(cpu 0 caller 0xffffff7f92161c85): NVRM[0/1:0:0]: Read Error 0x00000100: CFG 0xffffffff 0xffffffff 0xffffffff, BAR0 0xd2000000 0xffffff812543d000 0x0a5480a2, D0, P2/4
    Backtrace (CPU 0), Frame : Return Address
    0xffffff8125222f70 : 0xffffff8011a1d5f6
    0xffffff8125222fe0 : 0xffffff7f92161c85
    0xffffff8125223070 : 0xffffff7f9225b5b7
    0xffffff81252230d0 : 0xffffff7f9225b62b
    0xffffff8125223140 : 0xffffff7f92570883
    0xffffff8125223280 : 0xffffff7f9228175d
    0xffffff81252232b0 : 0xffffff7f9216b9e6
    0xffffff8125223360 : 0xffffff7f921670b8
    0xffffff8125223550 : 0xffffff7f921682e4
    0xffffff8125223620 : 0xffffff7f93219494
    0xffffff81252236e0 : 0xffffff7f93249f8b
    0xffffff8125223770 : 0xffffff7f9322f638
    0xffffff81252237d0 : 0xffffff7f9322fefc
    0xffffff8125223820 : 0xffffff7f932302e6
    0xffffff81252238c0 : 0xffffff7f93230d06
    0xffffff8125223900 : 0xffffff7f931ebf31
    0xffffff8125223a80 : 0xffffff7f9322d2ee
    0xffffff8125223b40 : 0xffffff7f931eaa3a
    0xffffff8125223ba0 : 0xffffff8011e64929
    0xffffff8125223bc0 : 0xffffff8011e65ed0
    0xffffff8125223c20 : 0xffffff8011e638ef
    0xffffff8125223d70 : 0xffffff8011a981a1
    0xffffff8125223e80 : 0xffffff8011a20abd
    0xffffff8125223eb0 : 0xffffff8011a10448
    0xffffff8125223f00 : 0xffffff8011a195fb
    0xffffff8125223f70 : 0xffffff8011aa5ad6
    0xffffff8125223fb0 : 0xffffff8011aced13
          Kernel Extensions in backtrace:
             com.apple.NVDAResman(8.0)[6A699209-FB98-316B-A3C0-DCA82AA8C86B]@0xffffff7f920fa 000->0xffffff7f923fcfff
                dependency: com.apple.iokit.IOPCIFamily(2.7)[8C9E06A4-13D0-33F5-A377-9E36F0ECC229]@0xffffff 7f9206f000
                dependency: com.apple.iokit.IONDRVSupport(2.3.4)[E37F420A-B5CD-38ED-9441-5247583B6ACE]@0xff ffff7f920e6000
                dependency: com.apple.iokit.IOGraphicsFamily(2.3.4)[5D671681-D21B-3CCA-9810-B15E648C1B27]@0 xffffff7f920a3000
             com.apple.nvidia.nv50hal(8.0)[9CD95A4A-FD94-349E-A4B6-FC3B74E197F5]@0xffffff7f9 240a000->0xffffff7f9272cfff
                dependency: com.apple.NVDAResman(8.0.0)[6A699209-FB98-316B-A3C0-DCA82AA8C86B]@0xffffff7f920 fa000
                dependency: com.apple.iokit.IOPCIFamily(2.7)[8C9E06A4-13D0-33F5-A377-9E36F0ECC229]@0xffffff 7f9206f000
             com.apple.GeForce(8.0)[91C40470-82BA-329A-A9D7-4C70F28275FD]@0xffffff7f931de000 ->0xffffff7f932a0fff
                dependency: com.apple.NVDAResman(8.0.0)[6A699209-FB98-316B-A3C0-DCA82AA8C86B]@0xffffff7f920 fa000
                dependency: com.apple.iokit.IONDRVSupport(2.3.4)[E37F420A-B5CD-38ED-9441-5247583B6ACE]@0xff ffff7f920e6000
                dependency: com.apple.iokit.IOPCIFamily(2.7)[8C9E06A4-13D0-33F5-A377-9E36F0ECC229]@0xffffff 7f9206f000
                dependency: com.apple.iokit.IOGraphicsFamily(2.3.4)[5D671681-D21B-3CCA-9810-B15E648C1B27]@0 xffffff7f920a3000
    BSD process name corresponding to current thread: WindowServer
    Mac OS version:
    12A269
    Kernel version:
    Darwin Kernel Version 12.0.0: Sun Jun 24 23:00:16 PDT 2012; root:xnu-2050.7.9~1/RELEASE_X86_64
    Kernel UUID: 8D5F8EF3-9D12-384B-8070-EF2A49C45D24
    Kernel slide:     0x0000000011800000
    Kernel text base: 0xffffff8011a00000
    System model name: MacBookPro6,2 (Mac-F22586C8)
    System uptime in nanoseconds: 639058131311
    last loaded kext at 619649350014: com.apple.driver.AppleUSBCDC     4.1.21 (addr 0xffffff7f93e14000, size 16384)
    last unloaded kext at 265588829535: com.apple.driver.AppleUSBUHCI     5.1.5 (addr 0xffffff7f92a46000, size 65536)
    loaded kexts:
    com.apple.driver.AppleUSBCDC     4.1.21
    com.apple.filesystems.udf     2.3
    com.apple.filesystems.msdosfs     1.8
    com.apple.filesystems.smbfs     1.8
    com.apple.driver.AudioAUUC     1.60
    com.apple.driver.AppleHWSensor     1.9.5d0
    com.apple.filesystems.autofs     3.0
    com.apple.filesystems.ntfs     3.10
    com.apple.iokit.IOBluetoothSerialManager     4.0.9f8
    com.apple.driver.AGPM     100.12.69
    com.apple.driver.AppleMikeyHIDDriver     122
    com.apple.driver.AppleHDA     2.3.0f2
    com.apple.driver.AppleUpstreamUserClient     3.5.10
    com.apple.driver.AppleSMCPDRC     1.0.0
    com.apple.driver.AppleMikeyDriver     2.3.0f2
    com.apple.driver.AppleLPC     1.6.0
    com.apple.driver.AppleIntelHDGraphics     8.0.0
    com.apple.driver.ACPI_SMC_PlatformPlugin     1.0.0
    com.apple.driver.AppleMuxControl     3.2.6
    com.apple.iokit.BroadcomBluetoothHCIControllerUSBTransport     4.0.9f8
    com.apple.driver.AppleMCCSControl     1.0.33
    com.apple.iokit.IOUserEthernet     1.0.0d1
    com.apple.Dont_Steal_Mac_OS_X     7.0.0
    com.apple.driver.ApplePolicyControl     3.2.6
    com.apple.driver.AppleSMCLMU     2.0.2d0
    com.apple.GeForce     8.0.0
    com.apple.driver.AppleIntelHDGraphicsFB     8.0.0
    com.apple.driver.SMCMotionSensor     3.0.2d6
    com.apple.driver.AppleUSBTCButtons     235.4
    com.apple.driver.AppleUSBCardReader     3.1.0
    com.apple.AppleFSCompression.AppleFSCompressionTypeDataless     1.0.0d1
    com.apple.AppleFSCompression.AppleFSCompressionTypeZlib     1.0.0d1
    com.apple.BootCache     34
    com.apple.driver.AppleUSBTCKeyboard     235.4
    com.apple.driver.AppleIRController     320.15
    com.apple.driver.XsanFilter     404
    com.apple.iokit.IOAHCIBlockStorage     2.2.0
    com.apple.driver.AppleUSBHub     5.1.6
    com.apple.driver.AppleFWOHCI     4.9.5
    com.apple.driver.AirPort.Brcm4331     600.15.20
    com.apple.iokit.AppleBCM5701Ethernet     3.2.5b3
    com.apple.driver.AppleAHCIPort     2.4.0
    com.apple.driver.AppleUSBEHCI     5.1.5
    com.apple.driver.AppleEFINVRAM     1.6.1
    com.apple.driver.AppleSmartBatteryManager     161.0.0
    com.apple.driver.AppleRTC     1.5
    com.apple.driver.AppleACPIButtons     1.6
    com.apple.driver.AppleHPET     1.7
    com.apple.driver.AppleSMBIOS     1.9
    com.apple.driver.AppleACPIEC     1.6
    com.apple.driver.AppleAPIC     1.6
    com.apple.driver.AppleIntelCPUPowerManagementClient     196.0.0
    com.apple.nke.applicationfirewall     4.0.39
    com.apple.security.quarantine     2
    com.apple.driver.AppleIntelCPUPowerManagement     196.0.0
    com.apple.kext.triggers     1.0
    com.apple.iokit.IOSerialFamily     10.0.6
    com.apple.driver.DspFuncLib     2.3.0f2
    com.apple.iokit.IOAudioFamily     1.8.9fc9
    com.apple.kext.OSvKernDSPLib     1.6
    com.apple.iokit.IOFireWireIP     2.2.5
    com.apple.driver.IOPlatformPluginLegacy     1.0.0
    com.apple.driver.IOPlatformPluginFamily     5.2.0d16
    com.apple.driver.AppleHDAController     2.3.0f2
    com.apple.iokit.IOHDAFamily     2.3.0f2
    com.apple.driver.AppleSMBusPCI     1.0.10d0
    com.apple.iokit.AppleBluetoothHCIControllerUSBTransport     4.0.9f8
    com.apple.driver.AppleBacklightExpert     1.0.4
    com.apple.driver.AppleSMBusController     1.0.10d0
    com.apple.iokit.IOSurface     86.0.2
    com.apple.iokit.IOBluetoothFamily     4.0.9f8
    com.apple.driver.AppleGraphicsControl     3.2.6
    com.apple.nvidia.nv50hal     8.0.0
    com.apple.NVDAResman     8.0.0
    com.apple.iokit.IONDRVSupport     2.3.4
    com.apple.iokit.IOGraphicsFamily     2.3.4
    com.apple.driver.AppleSMC     3.1.3d11
    com.apple.iokit.IOSCSIBlockCommandsDevice     3.5.1
    com.apple.iokit.IOUSBMassStorageClass     3.5.0
    com.apple.iokit.IOSCSIArchitectureModelFamily     3.5.1
    com.apple.driver.AppleUSBMultitouch     235.7
    com.apple.iokit.IOUSBHIDDriver     5.0.0
    com.apple.driver.AppleUSBMergeNub     5.1.5
    com.apple.driver.AppleUSBComposite     5.0.0
    com.apple.iokit.IOFireWireFamily     4.5.5
    com.apple.iokit.IOUSBUserClient     5.0.0
    com.apple.iokit.IO80211Family     500.15
    com.apple.iokit.IOEthernetAVBController     1.0.2b1
    com.apple.iokit.IONetworkingFamily     3.0
    com.apple.iokit.IOAHCIFamily     2.2.0
    com.apple.iokit.IOUSBFamily     5.1.6
    com.apple.driver.AppleEFIRuntime     1.6.1
    com.apple.iokit.IOHIDFamily     1.8.0
    com.apple.iokit.IOSMBusFamily     1.1
    com.apple.security.sandbox     220
    com.apple.kext.AppleMatch     1.0.0d1
    com.apple.security.TMSafetyNet     7
    com.apple.driver.DiskImages     344
    com.apple.iokit.IOStorageFamily     1.8
    com.apple.driver.AppleKeyStore     28.18
    com.apple.driver.AppleACPIPlatform     1.6
    com.apple.iokit.IOPCIFamily     2.7
    com.apple.iokit.IOACPIFamily     1.4
    com.apple.kec.corecrypto     1.0
    Model: MacBookPro6,2, BootROM MBP61.0057.B0F, 2 processors, Intel Core i5, 2.4 GHz, 8 GB, SMC 1.58f16
    Graphics: Intel HD Graphics, Intel HD Graphics, Built-In, 288 MB
    Graphics: NVIDIA GeForce GT 330M, NVIDIA GeForce GT 330M, PCIe, 256 MB
    Memory Module: BANK 0/DIMM0, 4 GB, DDR3, 1067 MHz, 0x80AD, 0x484D54333531533643465238432D48392020
    Memory Module: BANK 1/DIMM0, 4 GB, DDR3, 1067 MHz, 0x80AD, 0x484D54333531533643465238432D48392020
    AirPort: spairport_wireless_card_type_airport_extreme (0x14E4, 0x93), Broadcom BCM43xx 1.0 (5.106.98.81.20)
    Bluetooth: Version 4.0.9f8 10405, 2 service, 18 devices, 1 incoming serial ports
    Network Service: Wi-Fi, AirPort, en1
    Serial ATA Device: OCZ-VERTEX2, 120.03 GB
    Serial ATA Device: Hitachi HTS545032B9SA02, 320.07 GB
    USB Device: hub_device, 0x0424  (SMSC), 0x2514, 0xfa100000 / 2
    USB Device: USB Mass Storage Device, 0x0457  (Silicon Integrated Systems Corp.), 0x0151, 0xfa140000 / 6
    USB Device: BRCM2070 Hub, 0x0a5c  (Broadcom Corp.), 0x4500, 0xfa110000 / 5
    USB Device: Bluetooth USB Host Controller, apple_vendor_id, 0x8218, 0xfa113000 / 7
    USB Device: Internal Memory Card Reader, apple_vendor_id, 0x8403, 0xfa130000 / 4
    USB Device: Apple Internal Keyboard / Trackpad, apple_vendor_id, 0x0236, 0xfa120000 / 3
    USB Device: hub_device, 0x0424  (SMSC), 0x2514, 0xfd100000 / 2
    USB Device: hub_device, 0x0424  (SMSC), 0x2514, 0xfd130000 / 5
    USB Device: iPhone, apple_vendor_id, 0x12a0, 0xfd133000 / 7
    USB Device: Razer Mamba, 0x1532, 0x000a, 0xfd134000 / 6
    USB Device: Built-in iSight, apple_vendor_id, 0x8507, 0xfd110000 / 4
    USB Device: IR Receiver, apple_vendor_id, 0x8242, 0xfd120000 / 3

    Welcome to Apple Support Communities
    Install > http://codykrieger.com/downloads/gfxCardStatus-2.2.1.zip Open this app and select Integrated Only. It's a bug with NVIDIA graphics

  • HT201257 Apple Hardware Test won't stop

    My daughter went to turn on her MacBook and the Apple Hardware Test came up.  I Googled what the AHT was & so we let it run in order to shut it down.    When we started it up again, the AHT popped up again.  We cannot get it to stop! (There is no disk inserted & she does not even remember hitting any keys that may have started this in the first place.)  Thanks for any help you can lend.

    Reset your computer’s PRAM

  • Can't get Apple Hardware Test to work

    So I'm trying to run the Apple Hardware Test. I start the computer up and hold "D". It boots into OS X like a normal startup. So, I plug in the Ethernet and hold option-D to do the AHT from the Internet. It tells me "Apple Hardware Test does not support this machine".
    So, I try to install the "iMac EFI Update 1.8" from http://support.apple.com/kb/DL1493 (which is for my iMac model, which is a iMac (Mid 2010)), but it says "This software is not supported on your system." I also tried the later version, v1.9, from http://support.apple.com/kb/DL1498 but it isn't for my iMac and so I get the same error.
    So now I'm stuck. What should I do now?

    Thanks that was it. It says AHT on the disk itself. I successfully ran it, and it found no problems ("No trouble found.") I ran the basic test only because I have 16 GB RAM, and so I imagine it would take a long time to run the extended—probably at least two hours? And I don't know what more that would find that the basic wouldn't?

  • My iMac won't start up -- makes the usual start up sound, get the gray screen with the apple, and whirling icon goes endlessly below it.  apple hardware test code is 4MOT/2/40000004:0x3d2fdb90

    Prior to shutting it down, I had to force quit Safari.  I has been running a little slow lately, but nothing major.
    Apple Hardware Test code shows
    4MOT/2/40000004:0x3d2fdb90
    anyone know what that means?
    I have a late 2006 intel-based iMac with the iSight camera, running Snow Leopard

    Thanks SO MUCH!  I am having nightmares about all that could be lost.  If the fan can be fixed, then I can cope with the backing up and maybe relieve the hard drive so it gets faster.  As Murphy's law would have it, I just bought an external drive but haven't had a chance to set it up to automatically back up.  Your reply makes me feel much better... There is hope that I can lip along with this old iMac until I can afford a new one.

  • Cannot start-up to the Apple Hardware Test — MacBook Pro & Lion

    Whenever I try holding the D key before and throughout all of the start-up process, it simply makes the grey screen appear for longer, and slow the whole process... but never beings the Apple Hardware Test.
    I'm following Apple's official instructions:
    To start up your computer in Apple Hardware Test:
    Press the power button to turn on your computer.
    Press and hold the D key before the gray startup screen appears. An Internet-enabled connection via Ethernet or Wi-Fi is required to use this feature.
    Note: Some Macintosh computers that shipped with OS X Lion support the use of Apple Hardware Test over the Internet. These computers will start up to an Internet-based version of AHT if the hard drive does not contain AHT.
    Why doesn't it work?
    My MBP was shipped as follows:
    For Apple computers that shipped with Mac OS X v10.5.5 to 10.6.7, Apple Hardware Test is located on the Applications Install Disc 2 and should be included with your computer.
    But I have upgraded to Lion! Do I need the disk still? If so, why am I to lumber around a disk from a previous OS... good that I didn't throw it out!

    I'm trying to find the answer to a similiar question.  Here's my thread.
    https://discussions.apple.com/thread/3549995

  • MacBook won't boot after trying to repair with Disk Utility. Cannot boot in Safe Mode. Just powers down after about 5 minutes. Apple Hardware Test says error 4SNS/1/40000001:IG0C-0.265 But I cannot find anything on the net about it. MacBook 4,1 Intel.

    Hello Everyone,
    I am in dire need of assistance I am hoping someone could provide. I have a MacBook 4,1 with Intel Core 2 Duo processor 4GB Ram. It is taking over 10 minutes to boot up past the gray apple screen when I turn it on. First I cleared the PRam (?) then I checked the disk using Disk Utility Verify, and it said the disk needed repairs. So I ran the disk repair and it said it was unable to fix the errors on the HD.
    I did a little research and tried booting into the Single User mode, then running /sbin/fsck -fy. It said that it found errors but could not fix them. I ran it two more times as suggested and got the same result each time. I then tried rebooting and now instead of taking 10 minutes to boot up, it takes about 5 minutes on the gray apple screen and then just turns off. I started in Verbose mode to try to troubleshoot the error and it appears the last thing to come across the screen before power down is a message "Apple Yukon 2: RxRingSize <= 1024....etc".
    I decided next I would run the Apple Hardware Tester. The test came back with an error code "4SNS/1/40000001:IG0C-0.265". I am very good at searching the web but I could not find any errors that had the IG0C or IGOC or any combination at the end, but plenty of 4SNS/1/40000000(1) errors with different endings. From what I can tell people are saying anything with 4SNS/1/4000000 is a logic board failure, but this computer was literally just booting this morning until I did the /sbin/fsck -fy.
    Any suggestions are welcome and appreciated.
    Thank you for your time.

    You've a couple of issues .... when Disk Utility tells you it can't repair a drive, if the error is a soft error, like an invalid tree or node, Disk Warrior (or TechTool Pro) can handle it. However, if Disk Warrior (or TechTool Pro) can't handle it, you can erase and write zero's to the hard drive and restore to it, or you can buy a new hard drive. Sometimes running SMART Utility can provide additional insight into the health of the hard drive. 
    THe 4SNS error is a sensor error.  You could install iStat Pro to see if something is indeed getting too hot or remaining room temp or less.  You may need to take it into an Apple shop so they can use their thermal diagnostics to test and isolate it further.

  • Won't boot from Apple Hardware Test or 10.1 Install disc

    Disk utility states that I need to boot from a CD and then run Disk Utility to repair my disk. However, neither CD seems to be recognized as a viable startup disk from either holding down the C key or trying to select it as a startup disk in System Prefs.
    FYI, I am running 10.6 and trying to boot from a 10.1 disc and an Apple HT disc with SW version 1.2

    There is no way any Intel Mac will run with 10.1 -- it was released before there was any Intel support in the OS.
    Every Mac model requires a specific version of the Apple Hardware Test to support its hardware. (If yours is the "Late 2008" black MacBook, the Mactracker database says it requires version 3A147.) Somewhere in the fine print of your original grey system disc set, or on any other grey system disc for any model, you will find the version of AHT it contains, if it contains any version. Unless that version is the same as your Mac requires, it won't work.

  • Apple Hardware Test wont start

    Hey!
       I hope someone can help, I have a mid 2009 Macbook Pro, I want to run Apple Hardware Test, by holding down the D key whilst restarting the computer or from the computer being completely shut down it doesn't work. I have also tried booting AHT with the installation disk in the drive.
    Any thoughts?

    Try starting the AHT with the OPTION + D keys.
    You should be able to use the #2 install disk.  It has the AHT instructions on it.
    Ciao.

  • How to start Apple Hardware Test under OS X Lion

    Since I made the upgrade to OS X Lion I cannot start Apple Hardware Test with the old method that works under Snow Leopard.
    Under OS X 10.6.8 I used to keep D key pressed until a picture appeared in the middle of the screen. With Lion it doesn't work, even under Wi-Fi internet connection.
    Any suggestions?

    Have a look at this discussion https://discussions.apple.com/message/15772841#15772841
    Stefan

  • 2011 Imac. Won't run Apple Hardware Test

    Upgraded to Yosemite and now my DVD drive doesn't play or burn. I'm trying to do an Apple Hardware Test. That doesn't work either. I follow the instructions to shut down the computer and hold down on the D key. That is not working. It just continues its start up
    I've tried and it has failed about half a dozen times. Is there another way to get it to work?

    FWIW. Mine boots into AHT with disc 2 inserted, restarting, and holding down the D key. Alternatively, mount disc 2, run this command in the Terminal app, OPTION-click & hold Finder's Dock icon, and select RELAUNCH:
    defaults write com.apple.finder AppleShowAllFiles 1
    That unhides all hidden files/folders.
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    Run this command to hide the normally hidden files/folders and RELAUNCH the Finder again.
    defaults write com.apple.finder AppleShowAllFiles 0
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  • HT201257 Holding down "D" no longer starts Apple Hardware Test!  Any idea what's happened and how I fix it?  Or do I need to go to the Genius Bar?  MacBook Pro with Lion Preinstalled.

    I have a MacBook Pro with Lion Preinstalled, so AHT was present on the hard disc and worked when the product was new.  One of the first things I did from new was run AHT and it worked fine.  But now it doesn't start - instead the machine (eventually) boots into normal OS X.
    Holding down "D" no longer starts Apple Hardware Test!  Any idea what's happened and how I fix it?  Or do I need to go to the Genius Bar? 
    Software  Mac OS X Lion 10.7.3 (11D50b), if it makes any difference.
    Any ideas?

    Thanks.  However, even with an internet connection that doesn't work for me - the machine just (after an extended delay) boots normally.  It doesn't download.
    Option-D works for an Internet-based AHT.  However that only works with an internet connection.  It doesn't seem to download it and install it - it needs internet every time.
    Any idea how my local copy of AHT disappeared?  I haven't repartitioned the drive or knowingly deleted anything.  And how do I reinstate it (because if you need AHT your hardware problems may preclude internet access!)?

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