Lost apple hardware tests disk

Does anybody know where i may be able to obtain another copy of the apple hardware test disk? I thought it was on my installation disks but its not.
imac g5 rev a 60g hd 1G Ram   Mac OS X (10.4.1)   upgraded for mac os x 3.9

Dennis-
Did you try this:
1. Insert Install Disk 1.
2. Restart & hold option key as it start up.
3. Click Apple Hardware Test when available startup volumes appear.
4. Click the right arrow.
5. The Apple Hardware Test main screen should appear.

Similar Messages

  • 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.

  • Can Apple Hardware Test disk work when a hard drive has no OS installed yet

    I removed a bad original hard drive from a PowerBook G4 12" aluminum notebook. It made clicking sounds as it ran, and would not boot. I replaced it with a 320GB Western Digital HD. I also upgraded the original 512KB memory with 1GB.
    Before removing the bad hard drive, I was able to boot just beyond the language selection dialog from a full installation CD (Mac OS X v10.2) while holding the "C" key during power on, but could not install it, of course, on the bad hard drive.
    Now with new hard drive replacement in the PowerBook (formatted via fire wire from a MacBook Pro running Snow Leopard) and the upgraded memory, I ran a Disk Utility check via fire wire and found the new hard drive in the PowerBook to be in good working order and ready for an OS installation. However I can no longer boot the PowerBook G4 with the full installation CD in the customary manner, getting instead the flashing question mark over the finder folder icon.
    I decided to see if there might be some other problem by using a PowerBook G4 Apple Hardware Test disk. Upon booting from the test disk, I get a message that declares the disk will not work with the PowerBook G4 machine.
    What's up?
    Message was edited by: techtoots

    There's more to my original question than whats on the face of it. Please read more about this below. However, I will still wish to know if an AHT, say an original one if that's important, will do it's thing when no OS is installed.
    Pretty sure that I'm NOT using either disk or sets of disks that came with this G4 PB. Included among what I do have are 6 grey disks:
    __PB G4 Software Restore 1
    __PB G4 Software Restore 2
    __PB G4 Software Restore 3
    __PB G4 Mac OS 9 Install v9.2.2
    __PB G4 Mac OS X Install v10.1.4
    __PB G4 Applications
    And 2 Jaguar full install DVDs:
    __Mac OS X v10.2 Install Disc 1
    __Mac OS X v10.2 Install Disc 2
    I was hoping to be able to find something useful among these disks - if not in a strait forward manner, them by some manner of hacking.
    I know how to use my MacBook Pro create a disk image that will house any number of these DVDs. My thought is to create something that can be cloned to the PB G4 via fire wire. I just need to be sure how to daisy chain multiple DVDs in terminal mode, if more than one DVD is required in the cloning process.
    I have placed an order for Leopard 10.5 - full installation DVD direct from Apple.
    Once received, I will have 14 days to return it unopened. So, I want to be sure this PB G4 is operable before I break the seal on the Leopard package.
    Therefore it's not so important that I clone everything from the original installation - just enough to see that the PB G4 boots and runs in Finder. If I can achieve that much, I will advance with Leopard 10.5 when it arrives.
    My *PROCESSOR SPEED* is 1.33GHz
    Other original specs:
    L2 Cache 512 KB
    Memory 512 MB
    Bus Speed 167 MHz
    Boot ROMV 4.8.3f1
    Memory Slot 256 MB DDR-SDRAM

  • Lost my Hardware Test disk!  Options?  Want to test RAM...

    So my dual 2.0 G5 (first version) is starting to run really sloooow. Lots of pinwheel, long time to move between apps, etc. I'm wondering if the RAM is finally pooping out on me. So, I'm looking to run a looped Hardware Test overnight, to see what it may find.
    Only one problem...I CAN'T FIND MY INSTALL DISK! I've got the 2nd disk here, but the 1st one isn't in the pack. Of course, it has the Hardware Test on it. I've got BOTH disks from my G4 PowerBook, but the G5 won't boot from these disks.
    Any options here? Is there a place I can go to download this disk, or request another? Are there other recommended applications to test my RAM on this machine? I'd like to figure out what's causing it to bog down, as it's starting to get really annoying.

    Are you saying that 2GB should be ok...
    I'm trying to say that 2GB isn't much anymore, just for even Browsing the Internet.
    My G5 came with 2 GB, tested it on my Dial-up even though I had 8 more GB already waiting before I got the G5... despite 2GB saying there was plenty of free RAM, upping to 10GB made everything faster... My Big Ataris handle a 2 button mouse & a full Keyboard with 40+ iterations of the F Keys in 100 Bytes, last Mac KB update was 32MB, last Mouse update was 80MB, things have gone exponentially backwards.

  • Cant run apple hardware test

    I have a G5 20" iMac, intel based. I've been trying to perform a Apple Hardware test but am unable to get it started.
    Any help?

    Thanks. Yes, I have a late 2007 20" imac. The model I have is a 2 GHz Intel Core 2 Duo, with 2 GB 667 MHz DDR2 SDRAM of Memory. I have a 320 GB Hard drive. The disks that came with the computer when I bought it in 2009 from Apple (3 of them) say iMac G5. I have 2 G5 Mac OS X install disks and a G5 Add'l Software and Apple Hardware Test Disk.
    My problem started a couple of weeks ago when I would be getting the spining rainbow beach ball. I've opened Utility Disk and have Repaired Disk Permissions.
    When I tuen on my computer I follow the instructions to the letter (from the link you gave me, I already had that and have tried it a few times) and it still will not start the test.
    Each time I try it, I get the grey progress bar underneath the Apple Logo and spinning grey gear. The progress bar goes about a third of the way and ends then, the blue screen appears and my login window appears.
    I have tried to run the Hardware Test by booting from the Install Disk, and from the Hardware Test Disk as well and the same this happens.
    No matter what I do I can't seem to get the test to start, nor, start my computer without this Grey Progress bar underneath the Apple Logo and spinning gear.
    I susspect I need additional Ram installed, but do not know how to check my computer to find out.
    Lastly, the computer will only work for about 5 - 15 minutes normally after logging on. After this time the rainbow beach ball comes back and even the simplest of task can't be performed with a wait for the beach ball to stop and go away...
    I'm stuck and don't know how to proceed...
    I have $0 money left to invest in a certified Apple technician to come to the house to fix the problem...
    Help....
    Thanks,
    Brian

  • IMac intel late 2006, lost DVDs, how to run apple hardware test

    Hello, Applers,
    I have an iMac intel core 2 duo late 2006. I have upgraded it to snow leopard. From two months ago, it began to show distorted pictues, random lines/pixels/, and regular freezing. But if I boot it into the safe mode, it works well, although there is no sound or webcam. I did a research online and it seems that I should run apple hardware test (AHT) first. But the DVDs came withi this machines have been lost. where can I download this software? I would greatly appreciate your help if any of you who also have this model of machine and would like to lend me your DVDs.
    any suggestions are welcome.

    You can purchase replacements from AppleCare:
    Apple Store Customer Service at 1-800-676-2775 or visit online Help for more information.
    To contact product and tech support visit online support site.
    There is no way to run the AHT without the discs.
    If it works OK in safe mode then you might think about:
    Resetting your Mac's PRAM and NVRAM
    Intel-based Macs: Resetting the System Management Controller (SMC)
    Reinstall Snow Leopard:
    Reinstall OS X without erasing the drive
    Do the following:
    1. Repair the Hard Drive and Permissions
    Boot from your Snow Leopard Installer disc. After the installer loads select your language and click on the Continue button. When the menu bar appears select Disk Utility from the Utilities menu. After DU loads select your hard drive entry (mfgr.'s ID and drive size) from the the left side list.  In the DU status area you will see an entry for the S.M.A.R.T. status of the hard drive.  If it does not say "Verified" then the hard drive is failing or failed. (SMART status is not reported on external Firewire or USB drives.) If the drive is "Verified" then select your OS X volume from the list on the left (sub-entry below the drive entry,) click on the First Aid tab, then click on the Repair Disk button. If DU reports any errors that have been fixed, then re-run Repair Disk until no errors are reported. If no errors are reported click on the Repair Permissions button. Wait until the operation completes, then quit DU and return to the installer.
    If DU reports errors it cannot fix, then you will need Disk Warrior and/or Tech Tool Pro to repair the drive. If you don't have either of them or if neither of them can fix the drive, then you will need to reformat the drive and reinstall OS X.
    2. Reinstall Snow Leopard
    If the drive is OK then quit DU and return to the installer.  Proceed with reinstalling OS X.  Note that the Snow Leopard installer will not erase your drive or disturb your files.  After installing a fresh copy of OS X the installer will move your Home folder, third-party applications, support items, and network preferences into the newly installed system.
    Download and install the Combo Updater for the version you prefer from support.apple.com/downloads/.

  • 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.

  • 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.

  • Disk repair and Apple Hardware Test says HD has no problem but grey screen still persists on MBP

    5 days ago while on vacation, my MBP just froze with the grey screen, apple logo and spinning gear.
    I performed all that was instructed on the following discussions:
    http://support.apple.com/kb/TS2570 
    except  Archive and Install installation of MAC OS X and Erase and Install  MAC OS X since I was able to save my files in  my husband's MBP via Firewire Target Disk Mode. At this point, I am still apprehensive in erasing my files and installing again the MAC OS X.
    When I did the Disk Repair under the Disk utilities, it says that my Mac Os X is ok.  (It also said ok when I did the fsck -fy when I till did not have my CD when I was on vacation)
    I also tried the Apple Hardware Test (AHT)   to further l test the hardware of my MBP and performed an extended checking and after an hour, its says that my HD has no problem.
    Yet, after all these, when I restart my computer, it still has the grey screen with apple logo and spinning wheel! 
    Can anyone tell me what else can I do??? Appreciate any help!

    I like the free demo of SuperDuper to make clones. It's free,  Leopard and Snow ready and is easy to use. If you buy the full version you can do incremental backups.
    You should use Disk Utility to do a Disk Repair, as shown in this link, booted up on your install disk, before you make a clone of it. I use DiskWarrior for that instead.
    I then partition my external disk, in Disk Utility, with a partition that is the same size , actually a tad bigger, as my system disk. I then use SuperDuper to clone my system disk over to that partition.
    With a clone on an external FireWire drive (USB drives are not bootable on PPC Macs but are on some Intel Macs) you can bootup on it to do your repairs, on the main drive, or just run your Mac anytime you have trouble with your main drive.
    That's why I like clones better then Time Machine. You can just bootup on them and use your Mac.
    On the DiskWarrior thing, I use DW once a month to try and catch errors in my system from getting too far out of hand. It has repaired every little and big issue I have ever had with my  three Macs.
    And I have had times when Disk Utility's Disk Repair says everything's fine but my system was still having issues. Disk Utility, in my experience, cannot be totally relied on to find and report all issues. It just isn't robust enough.
    I run DiskWarrior, it does find errors, repairs them and I'm back in business. I swear by it!
    DALE

  • Yet another pointless question about the practically non-existent iMac G5 Apple Hardware Test (AHT) disk.

    I have a 17" iMac G5 (iSight model) also known as model A1144, PowerMac12,1 or MA063LL/A.
    Where do I download the Apple Hardware Test (AHT) disk for this machine? Apparently nowhere. However, it would really help me on my quest if I knew what I was looking for.
    Does anyone know what AHT version is compatable with my machine? 2.2.1? 2.3.1?
    How about the part number on the disk? I have some Intel disks that say 2Z691-5734-A that (obviously) won't work.
    Is the AHT on Disk 1 or Disk 2? I'm starting to think there never was an AHT for this model.
    Where do I get those ASD disks the so called "geniuses" have?

    Disk 1: 2Z691-53179-A
    Disk 2: 2Z691-5493-A
    Compatible with eMac (2005), iBook G4 (Late 2004), iBook G4 (Mid 2005), iMac G5 17-inch (ALS), iMac G5 20-inch (ALS), iMac G5 (17-inch iSight), iMac G5 (20-inch iSight), iMac (Early 2006 17-inch), iMac (Early 2006 20-inch), Mac mini, Mac mini (Late 2005), Mac mini (Early 2006), MacBook Pro, Power Mac G5 (Early 2005), Power Mac G5 (Late 2005), PowerBook G4 (15-inch Double-Layer SD), PowerBook G4 (17-inch Double-Layer SD)
    http://www.welovemacs.com/2z69153179a.html
    AHT I think was on a seperate CD.
    Thanks Kappy, if v2.2.1 then search for...
    018-1680-A.dmg

  • Apple Hardware Test problems

    Hi All. I have a very weird problem here, as I can't get the Apple Hardware Test to start on my late 2008, 2.66 MBP15 inch model# MC026LL/A (released early 2009 as a quiet upgrade from 2.53). Here's the story:
    I opened up my machine as usual one morning, and the optical drive made a very weird noise I never heard before. So I decided to run the Apple Hardware Test (AHT) to see if anything was amiss. Well, I inserted the second install disk, held down the "d" key, and restarted the machine. It began to boot into the hardware test, but just after the AHT screen appears the computer just shut down. This happens every time I try to run the AHT.
    I went to an Apple Store while I was on holiday in Brisbane (they don't have one here in Adelaide), and the genius said it was likely a bad optical drive. Well, I returned to Adelaide last week and had the local Apple Authorized store replace the optical drive. Tried to run AHT once again, and the same problem persists. So the original problem wasn't with the optical drive.
    I thought maybe I accidentally used the startup disks for my wife's late 2008 15inch, 2.4, MBP (the one actually released in late 2008). I've looked around for the other sets of disks and can't find them. So here's what I'm asking help for: can someone who owns a 15inch MBP 2.66 15-inch (released in early 2009, model# MC026LL/A ) please tell me what the part # is for their set of install disks? It is written on the plastic sleeves of the install disks. And, could this person please tell which version of AHT is written on the disk itself? The set I have (which I think might be my wife's) has AHT version 3A158.
    Might this be the problem, or should my computer still be able to run the hardware test using my wife's disks? I know they are both technically late-2008 15inch unibody MBPs, but I think my 2.66 (again, quietly updated and released in early 2009) might require a different AHT version, which would explain my inability to run the test. If not, what might be causing my computer to not run the AHT? I tried reinstalling OS X to no avail.
    Thanks for all of your help!

    I think I share your skepticism--if your Mac was shipped with the later version of the OS, you should not have been able to do a clean install with discs of an earlier version. It looks like some machines originally shipped with OS X v. 10.5.5 and others with OS X v. 10.5.6. I don't remember just when 10.5.6 came out.
    Your two machines are likely very similar in build, and maybe similar enough for the OS to install. It may be that the AHT is specifically designed for the hardware in each machine, and that would be a bit different.
    As someone else said in another thread, there ought to be a tutorial on how to keep track of the original install discs since they are always getting lost. Maybe a secure note in the keychain or something like that.
    Out of curiosity, does the AHT work on your wife's machine? If not, there could be a problem with the install disc itself, and if so, you might be able to get a free replacement under warranty.
    Good luck!

  • Apple Hardware Test software for late '07 Macbook?

    Where do I get the Apple Hardware Test software for a late '07 Macbook?  Original disk is long lost and it doesn't appear Apple has this up for download.
    The battery is not taking any charge, totally dead after 772 cycles.  But don't know if its the battery or the Macbook's internal battery charging hardware.

    Using How to identify MacBook models your Macbook is a Macbook 3,1. At this link https://github.com/upekkha/AppleHardwareTest click on Macbook3,1 link which will download the AHT software. Here is the direct link - MacBook3,1 Mac-F22788C8.

  • COOL FEATURE-Apple Hardware Test built-in. No disc needed!

    It's a MacBook Late 2007... it would be interesting to see what other models have this feature.
    Start the Mac
    hold the D key
    do NOT put in your installer disc
    it starts up Apple Hardware Test (AHT) in like 5 seconds. No disc needed. VERY COOL
    (unfortunately, it seems to have been disabled after I did the Keyboard Firmware Update) -- 2 units, same issue.
    Is there a way to get this feature working again?
    What other models have (had) this feature?

    Well, I've tried some experiments:
    1) Removed the hard disk from the MacBook, and tried starting up while holding down the D key. Question mark icon. So apparently the AHT is not in ROM, but ensconced somewhere invisibly on the HD.
    2) Put the HD back in, started the MacBook from a standard, late-2007 retail 10.5.1 Install DVD (not the Install/Restore DVD that came with it). No AHT of course. And when it started up, the backlight went dark. Shining a lamp on the screen and looking from an angle, I was able to see enough to erase the HD. And tried starting again with the D pressed. Question mark icon. So apparently the AHT is not in a special HD partition that persists even when the HD is erased.
    3) Installed 10.5.1 on the MacBook HD using the standard 10.5 Install DVD (not the Install/Restore DVD that came with it); once again, running the MacBook from that DVD turned the display backlight off. Then started the MacBook with the D key pressed. Question mark icon. So the standard, retail 10.5 Installer doesn't install the AHT.
    4) Started the MacBook from its own Install/Restore DVD, and restored the factory HD setup. When setup was finished, shut down and started again pressing the D key. Apple Hardware Test (v.3A143) appeared.
    Conclusion: Apple Hardware Test is on the hard disk, not in ROM, installed as part of the software specific to this model. If the disk is erased and System software is installed from a generic 10.5 DVD - for instance, because the original Install/Restore DVDs have been lost - AHT will not be installed. So the instructions in the manual apply only so long as the original disk setup (or a restoration of same using the original DVDs) remains. Otherwise the original Install Disc #1 will be required to run Apple Hardware Test.

  • Apple Hardware Test (Extended) not progressing

    After upgrading my white MacBook (13-inch, mid 2010) from Snow Leopard to Lion, i was getting Kernel Panics, maximum of 5 min after startup. So i decided to downgrade back to Snow Leopard.
    I erased my hard disk, tried to install SL from the DVD that came with the MacBook, i got a Kernel Panic. I tried it for 6 times, all with the same result.
    I made the Apple Hardware Test, it passed.
    Now i'm trying the Apple Harware Test (Extended), it's been almost 6hrs and here's the status:
    Testing Memory
    No error messages
    Pass Number: 1
    Time: stuck on 2hr 15min 49sec
    Progress Bar: about 13%
    However the mouse is still responsive. Is it normal for the test to take this long.
    Thanks
    PS: i tried the option-commant P R before running this test, and i dont have any peripheral connected

    I have had endless issues with kernel panics since Lion.  Rolling back to SL won't save you, because the last couple of updates to SL added in the cause of the panics:
    Some combination of multitouch trackpad drivers and the graphics card drivers.
    So, what I've done, and it seems to work better ( I can use this POS laptop for more than an hour now) is:
    System prefs: turn off all the multouch stuff. All the gestures. Off.
    Also, battery life is low because this os constantly writes to the hard drive and uses the network card. If you happen to push the system while you hear the fans spin up as it receives a push notification ...panic.
    Spotlight has big problems with Lion.  I stopped it from indexing almost everything, installed quicksilver, then turned off indexing on the drive.  I uninstall flash unless I need it also.
    kernel panics for me would always feature AppleHWSensor in the panic log.
    60% triggered by me using the expose show desktop guesture.  However, I assigned that to a keystroke... works fine. 
    I've lost 3 hard drives to this garbage, ( you can't keep on just turning off modern unix systems, via kernel panic)
    Try what I suggested:
    No Flash until you need it.
    Turn off all the multitouch stuff in trackpad prefs
    stop spotlight from indexing your logs, and Caches. Then turn it off.

  • Apple Hardware Test stops responding

    While troubleshooting disk errors on an iMac (27 inch, mid-2010), I tried running the Apple Hardware Test from the Applications Install DVD that came with the computer, by inserting the DVD and holding down the "D" key while rebooting. The test begins normally, then stops working after a few minutes. I let the basic test continue working for more than 30 minutes (twice), but the progress bar hangs at around 95% and screen indicates it has been testing for 3 minutes 20 seconds. I also tried the extended testing and let it go for a couple of hours, but it also appeared to stop responding.
    Meanwhile, my iMac starts up normally again, after a few scary instances of the screen going black and immediately shutting down. Disk Utility has stopped returning error messages, and now reports that the "The volume appears to be OK". Is the failure of the Apple Hardware Test a symptom of hard drive or other problems?  Should I just let it run overnight and give it more time?  For comparison, I tried running AHT (basic and extended) on a MacBook Pro, and both finished normally with no problems.
    I appreciate any insights you can share!
    iMac (27-inch, Mid 2010)
    OS X Yosemite 10.10.2

    The original NVIDIA GeForce 8600M GT is able to take even 512 MB and do HCDP. Apple doesn't support this because they look for the mass of normal consumers and not for professionals. Than they would have used a Nvidia Qudro NVS 320M.
    Does any one tried "DirectX 10" and "PureVideo HD" on a booted Windows system on the new MBP? (here a link but in German:
    http://www.computerbase.de/artikel/hardware/grafikkarten/2007/vorschaunvidia_geforce_8mnotebooks/drucken/
    and one in English:
    http://www.nvidia.com/page/purevideo_hd.html
    I fear that Apple lost the orientation what is possible on a laptop today.
    What are your opinions?
    Michael

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