HT201257 Apple Hardware Test

will I lose any information on my computer if i run the Hardware Test?

The AHT doesn't fix anything. It merely checks specific hardware in the computer to be sure there isn't a problem.
Did you have these lines on your screen while running the AHT? If you boot from your OS X installer DVD do you still get lines on the screen?

Similar Messages

  • 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

  • HT201257 I just bought an imac in september 2012.  And i just find out that my microphone is not working.  So i did an apple hardware test and with no problems found?  I have sound but no one can hear me, not even the computer.  Should i bring it back to

    I just bought an imac in september 2012.  And i just find out that my microphone is not working.  So i did an apple hardware test and with no problems found?  I have sound but no one can hear me, not even the computer.  Should i bring it back to the store

    Before you go through that trouble open About this Mac > More Info... > System Report > Audio and see if the system actually knows it has a microphone.  Then you can look into Applications > Utilities >  Audio MIDI Setup and see if the microphone is there, select it and make sure the sliders are set to full. Then in System Preferences look for Sound > Input and make sure it shows up there and the sliders are at least half way up. If none of that works do a
    SMC RESET
    http://support.apple.com/kb/HT3964
    Shut down the computer.
    Unplug the computer's power cord and ALL peripherals.
    Wait 15 seconds.
    Attach the computers power cable.
    Wait another 5 seconds and press the power button to turn on the computer.
    It is the 5 second timing that initiates the reset.
    then go through the process of looking for the microphone again as the reset may reenable the mic.

  • HT201257 mac os x 10.4.11 tiger: apple hardware test has detected an error (what does this mean): 4SNS/1/40000001:VDOR

    Can someone help?  I did an apple hardware test and it has detected an error:  4SNS/1/40000001:VDOR
    What does that mean? Can i correct it myself? how?
    my computer is  "tiger" mac os x 10.4.11, Processor: 2.16 GHz Intel Core 2 Duo,  Memory: 2.5 Go 667 MHz DDR2 SDRAM

    Thank's for answering, realy appreciate your time,
    A technician had installed last year "mac os x snow leopard 10.6" (family pack) at around $49.00 - I had originaly mac os x 10.4.11 (tiger).  He had changed my hard drive, added memory: 2.5 Go 667 MHz DDR2 SDRAM, processor is: 2.16 GHz Intel Core 2 Duo  (he told me he had to change my hard drive probably due to a power shortage. Before he did the changes, I had done a hardware test: it gave me the same error as today 4SNS/1/40000001:DVOR,  He cleaned the inside, but he did not change any sensors. What am i to do???
    Not too long ago i started having problems. (probably from a power shortage, at one point.  I don't know if my external back up got corrupt. so i don't want to use it. He had eraced tiger 10.4.11 and installed snow leopard 10.6.
    I eraced snow leopard and installed mac os x 10.4.11 (that came with my computer).  
    I wanted to install mac os x 10.6 (snow Leopard) without eracing tiger (chat sites say you can do that) but it said it couldn't use my hard disk because of my memory:  my info says: used: 18,78 Go on the disk, available: 446.66 Go, Capacity: 465,44 Go
    So that's when i did a hardware test with the CD1 of mac os x 10.4 (tiger) and that where i got the message.
    If i have a sensor problem, then i guess i'm waisting my time trying to reinstall mac os x 10.6 (snow Leopard) or am i doing it wrong.  I was told i could leave tiger there and upgrade directly to snow leopard, without installing mac os x 10.5 (leopard).  
    Thank again

  • 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!)?

  • HT201257 Tried to perform the Apple Hardware Test by holding down the D key on restart - goes straight to my desktop.  Was told to try using te original cds that came with the computer - can't find them. Can I buy new ones or what do I do?

    Tried to perform the Apple Hardware Test by holding down the D key on restart - goes straight to my desktop.  Was told to try using te original cds that came with the computer - can't find them. Can I buy new ones or what do I do?

    Have the Mini's Serial# handy & call Apple Care, they usually have original replacement Discs available.

  • HT201257 Can I reinstall the Apple Hardware Test?

    After an OS reinstall, with a Macintosh HD erase, I've lost the ability to run the Apple Hardware Test directly from my drive.
    Now when I try to run it, it only does so from Internet Recovery Mode, which does not sit right by me, once it used to do so without requiring an internet connection and no official Apple article, specifically, warns you that any OS reinstall process can lead to this situation (at least none that I have discovered...)
    Is there any way I can get back that feature, which I presume would be installed in a Recovery partition?

    I was actually responding to your statement "I've lost the ability to run the Apple Hardware Test directly from my drive." and provided the link (see the Use Apple Hardware Test section) so that you can make sure you were performing the test correctly.
    Sorry, that the Article was of no help to you.

  • HT201257 I have a slow boot up, so I wanted to run Apple Hardware Test. AHT never starts

    I have a slow boot up, so I wanted to run Apple Hardware Test.
    AHT never starts based on http://support.apple.com/kb/HT1509 but AHT does not come up. Tried it 20 times, no success. I have iMac 2011 w/ Lion. What should I do.

    Hi Titan,
    My system didn came with the disk. I have used disk utility to repair the disk, because it showed a boot sector problem during disk verification process. I started disk utility using Cmd+R at startup. The problem was fixed. Not the disk verifies without error.
    However, the initial gery screen at startup still take more than two minutes after with the apple icon appears.
    Thanks.

  • I want to run apple Hardware Test but can't find it on any CD's.  I bought my iMac in 2009.  I think it had 10.4 installed.  It's not on my installation disk.  Where can I find it?

    I want to run Apple Hardware Text but can't find it on any CD's.  I bought my iMac in 2009.  It came with 10.4.  Apple Hardware Test is not on the installation disk.  Should I have it?  Where can I find it?  I"m now running 10.7.4.

    The disc plainly state:
    To  use the AHT, hold down the D key as the computer starts up.
    Works here. However, there was an issue with installing Lion that screwed this process up.
    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.
    Now, drill down to /"Applications Install\ Disc"/System/Library/CoreServices/ and drag the .diagnostics folder into your Lion boot volume's /System/Library/CoreServices/ folder. That might require you to authenticate to copy the folder into the CoreServices subfolder.
    Run this command to hide the normally hidden files/folders and RELAUNCH the Finder again.
    defaults write com.apple.finder AppleShowAllFiles 0
    This should allow the machine to boot into AHT when restarting and holding down the D key.
    If that doesn't do the trick, run this command in the Terminal app:
    sudo chown -R root:wheel /System/Library/CoreServices/.diagnostics
    At the Password: prompt, carefully type in your admin password, since nothing shows up on the screen, and hit the return key. Then, try another restart, holding down the D key.

  • Separate Apple Hardware Test DVD for MacBook Pro original??

    Hey Folks, I'm trying to verify whether or not the MacBook Pro came with the Apple Hardware Test as a separate DVD disk. The "MacBook Pro" Install disk references it but I can't seem to find the software on that DVD. Any guesses out there would be appreciated. I'm about to perform an upgrade for Tiger to Leopard and wnat to give my laptop the "hairy eyeball" before I begin.
    Many Thanks,
    Peter

    Insert the DVD and start up the computer with the D key held down. The Hardware Test is on a separate area of the DVD and isn't normally accessible.
    (38230)

  • I have a latest 2.7 EFI update but i still don't have the ATH(Apple Hardware Test) software! why is that so? do we have it on mountain lion?

    So as u know the question
    ill tell u the steps to try them out(no harm will be caused to u or ur com)
    During restart-up press the D button before the gray screen appears and hold it for about a minute until u see a 4 or 6 bit image of old mac icon appear and then it loads u go select any language and click hardware test full and then tell me if it DOES HAPPEN ON OS X 10.8(mountain lion).
    Thnx apple and u guys!

    To use Internet Apple Hardware Test, start up your Mac and hold down both the option and D keys on your keyboard.

  • Can anyone tell me what apple hardware test error code apple hardware 4MOT/4/40000002: Exhaust-1153 or 1209 means? I am running a MacBook Pro.

    Can anyone tell me what apple hardware test error code apple hardware 4MOT/4/40000002: Exhaust-1153 or 1209 means? I am running a MacBook Pro

    The motor on the exhaust fan has failed or is failing.

  • Can't boot off Apple Hardware Test disk

    Can anyone suggest why my laptop won't boot off of its Apple Hardware Test disk anymore? I have not tried it in years, but want to try now. I have the original, and a copy I made years ago, and neither will boot. I can select them at startup disks in that preference pane in OSX, but then it fails to find it, and boots into OSX. I can boot into OS9 on the hard drive. I was able to partially boot off of a different AHT disk from my 12" Albook G4, but it gave the message that I can't use that disk since it is not meant for the Tibook. One idea is that TechTool tells me that "macintosh startup file was absent", and the Help file states:
    "The Startup file is intended for use by systems that do not have built-in ROM support for booting from HFS Extended volumes. The first eight extents of the Startup File are stored in the Volume Header. This makes them easy to locate and read into memory. This file contains information used by the computer’s ROM to determine what program will boot the computer. In almost every case, this will be configured to point to the preferred System."
    But it does not tell me how to restore this Startup file.
    -how can i get my startup file back?
    -my computer boots fine off the hard drive, so is this file used only to boot off a CD?
    -any ideas why i can't boot off my AHT CD?

    Hi, t. (That alias of yours sure is a mouthful.) I think in your shoes I would pose the question to the tech support people at Micromat (TechTool's developer). It's their error message, after all, and they should be able to explain it to you in as much detail as you need. Perhaps they'll shed some light on the original problem in the process.

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

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