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)

Similar Messages

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

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 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

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

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.

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 to Apple Hardware Test or accept Boot Commands

Hi All,
I would appreciate some help with this issue, I am trying to boot up to the Apple Hardware Test on my Install Disk 1 that shipped with my MacBook Pro 2.4GHz Model #A1226 ordered new with 4 gigs of memory (around Aug. 2007). I am currently running 10.5.6 and the install disk of course contains the Tiger OS. I have nothing plugging into my computer, other than the Power Adapter. I have the proper install disk inserted in the computer and am holding down the "d" key on my built in keyboard throughout startup, but it will not go to the AHT. It simply boots to the normal login screen for Leopard. In fact the only boot commands that I see any visible or audible confirmation that it has taken effect is the option key, taking me to selecting a Startup Manager and holding down the Power Button gives me a tone from the internal speaker after a few seconds.
Below are what I have tried with seemingly no effect:
"d"
"c"
"t"
Option-Command-"p"-"r" (no beeps)
Command-"v"
Command-"s"
Shift (not sure I should see or hear any confirmation, I don't have any login items set right now so I can't tell if it has any effect)
I have not tried an of the networked drive boot commands as I don't have any networked drives
The only way I have been able to boot from either the optical drive or another disk is either holding down the option key during boot up or selecting the drive from the startup manager in system preferences.
I can't seem to access the AHT an in any way. The reason I am trying to access it is because I have had a few weird intermittent problems that I can't put my finger on and would like to be able to rule hardware out.
I also just replaced my HD with a WD 320 gig drive after my original drive failed due to a physical error. I just restored my data, and all seems to be running well after a permissions repair and a disk repair while booted up on my install disk.
The intermittent problems I was talking about are very vague and rare so I is difficult to describe them other that just a hunch that something is still a bit off. One is the display, every once in a while, showing what looks like a massive bar code or UPC code on my screen. This is not like the bands with soft edges that seem to be a well documented issue with the early MBP but transparent lines of alternating width and brightness with hard edges. Again it looks just like a UPC code transposed on my screen. The other items are random freezing of the OS or the mouse and the fact that my keyboard does not respond to any but a few boot commands. Again all the things are either rare and intermittent or do not come up in daily use of my machine. But when taken together, seem to add up to the conclusion there is still some issue present (at least in my mind).
To recap my specific questions relate to not being able to run the Apple Hardware Test and many of the boot commands having no effect. If you can shed light on the other items mentioned, great!
Thank you!

At a guess, I would think this error code has to do with the video artifacts you are experiencing. You might try reseating all the cables to the display. If the position of the screen makes a difference, there may be damage to a cable, particularly where it goes through the hinge.
Apple is the keeper of the error codes. If you have access to an Apple Store, you could probably ask about this.
Don't know about the other intermittent problems. Does an external keyboard work? If so, there's likely a problem with the internal, maybe even again, a cable or connection.
You could also try creating a new use account and see if the keyboard and mouse problems persist. If not, there could be some sort of software corruption in your usual account. Ditto with the freezing.
Good luck!

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.
Now, drill down to /"Applications Install\ Disc"/System/Library/CoreServices/ and drag the .diagnostics folder into your SL boot volume's /System/Library/CoreServices/ folder.
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

My Mid-2011 iMac with pre-installed Lion can't load AHT (Apple Hardware Test) over internet

I have a Mid-2011 iMac (3.4GHz) of which Apple's Support document for the Apple Hardware Test (http://support.apple.com/kb/ht1509) says:
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.
Well, this doesn't work for me. My Mac is on a DHCP-supporting router which has constant internet connection. Yet, when I turn off the Mac and then on again, holding the D key down even before the screen turns on, the Mac does indeed react to this key as it's then turning the screen on and taking another about half minute before it continues with the boot process along with showing the Mac symbol. Without the D, the Mac symbol comes up quickly.
So, it appears that the iMac is indeed trying to get AHT over the internet. Just that it doesn't succeed in it, and probably timing out after a while.
Any suggestions how to fix this?

Re
extract from kb article
PPPoE (where there is no router handling the PPPoE connection)
No
No
Captive-Networks (where you click an "Agree" button to access the Internet)
Yes
No
Proxies (where specific proxy servers must be configured in network preferences)
No
No
Certificate-based authentication / 802.1x
No
No
try check if you are in that case for your internet acces ?
could be a firewall problem too , if is possible try desable firewall ( or any internet filter )
no you can not see a wifi selection if you are wired ( using cable )
by the way D key for AHT need to be pressed AFTER start up sound , and hold at min one minute
HTH
Pierre

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.

Will Apple Hardware Test definitely detect RAM errors?

Hello,
Been having various problems with Leopard/MacBook. Someone suggested running Apple Hardware Test, which I did, in extended + looping mode all night (it cycled 6 times). The test turned up nothing. Can I take this to mean that whatever problems I am having are definitely software related? I am not familiar with the AHT, don't know exactly what it does, nor how I can interpret a "clean" result...
Many thanks for any advice/tips.

No indeed (just "Colin" is fine...)
My problems have mostly been documented by other people, and I have just been monitoring the discussions on these issues.
Specifically (at the risk of getting off-topic):
1) inconsistent shared server behaviour: I have 3 other macs at home - an iBook and a G4 MiniMac running Tiger, and a G4 tower, also running Leopard - and most of the time, the tower doesn't show up at all, but I can connect to it via CMD-K, the MiniMac shows up in the sidebar, but won't let me connect, and the iBook, when it is running, behaves normally. Oh, screen sharing doesn't work either: it tries connect but hangs (except for the iBook, which works). I could connect to all four quite normally after upgrading to 10.5.0, using the sidebar icons. Everything worked fine until sometime after the 10.5.1 update, when suddenly everything went pear-shaped. Nothing has changed in the configs of the other machines, and the iBook and the MiniMac are identical in terms of software config (but behave differently as regards this problem?!?)
Closing Airport and reopening it makes the icons reappear in the sidebar (all of them, G4 tower included), as does relaunching the Finder, but doesn't change the behaviour: I still can't connect. When I try to use the sidebar icon for the tower, it disappears (the icon...)
As far as I can tell, trying to operate shares from the G4 tower works as Apple intended (although I admit I have not exhaustively tested every option, as I don't have unlimited time...)
2) Lost my printer connections, both at work and at home. I managed to reestablish them at work, but I tried so many things that finally I'm not sure what actually worked. No dice at home (shared printer on the MiniMac... same problem as (1) I guess.)
3) the dreaded Keynote spontaneous reboot problem (I placed a reply about that last night here:
http://discussions.apple.com/message.jspa?messageID=6630702#6630702
4) diverse weird things, like
4a)iCal which had doubled all my events the last time I opened it. I had to manually delete one copy of every event I had entered, whereas I made these entries several weeks ago, and had consulted them many times... I'm thinking this is perhaps a result of the brutal reboots caused by (3)? Having deleted all the doubles, iCal seems to be behaving normally again.
4b)screen resolutions on my slave screen suddenly failing to select properly. I move my MacBook between two different external monitors, one at work, one at home, and their resolutions are different. Initially the MacBook had no trouble detecting and correctly setting the resolutions for the two screens, then suddenly my home screen went weird on me, and required a manual reset. Again, this was a once-off, and does not seem to be repeating (yet).
4c)sluggish performance with some apps that are normally quite snappy, like Firefox, which seems to hang a lot loading pages, Keynote (saving is often painfully slow), and indeed, trying to copy a 250Mb file from the tower to the MacBook via Airport (having connected using CMD-K) said it was going to take 33 hrs, which I thought was a bit rich...
4d) hot-swapping a usb pin for a keyboard+optical mouse receiver from the tower to the MacBook sometimes causes something inexplicable to happen to the MacBook's keyboard: both the Caps and the NumLock LEDs come on, and the keyboard has jumped into some config other than what it is normally in (French). I have not been able to determine what the keyboard actually thinks it is when this occurs (3 times now). The command keys (ctrl, alt, cmd) do not appear to work at all. Rebooting corrects it.
All up, pretty irritating, and a huge time waster, as you can well imagine. I stuck a bit of a rant on the discussions the other day in a moment of intense frustration, which got zapped by the moderators (probably not unreasonably!), but not before someone replied suggesting that it might be bad RAM, hence my questions here.

HT203570 Apple Hardware Test?

15.3" Macbook Pro A1286
early 2011
Came with OS X 10.6.3
Upgraded to 10.7.5
Holding "D" key during restart doesn't boot Apple Hardware Test
(boots Recovery HD, Mac OS X Utilities instead).
I would like to run AHT.
Apple didn't ship Installation DVDs.
Can I get a bootable system disk with AHT?

more:
Had just auto-updated OS X.
Running Safari. Fans went on high.
Wouldn't restart: Stuck on grey screen w/ logo and wheel turning.
Reset NVRAM.
Holding "D" key during restart doesn't boot Apple Hardware Test
(boots Recovery HD, Mac OS X Utilities instead).
AHT specific to machine. (I would like to run AHT.)
Can I get a bootable system disk with AHT?
Disk Utility repaired Macintosh HD disk.
Also erased disk.
Can run Macbook as target disk.
Startup disk doesn't show any bootable systems.
Restoring a Time Machine backup from an external HD disk =
erased disk okay,
shows that it writes files,
but estimates over 300 hours to finish. (~150Gig)
Apple didn't ship Installation DVDs.
Won't reload Mac OS X Lion from Apple.
says: "Downloading additional components. 2,925 hours remaining"
then after a few minutes:
"Can't download the additional components needed to install Mac OS X."
Network Utility shows Wi-Fi Link Speed: 54 Mbit/s
Internet Recovery: Command R doesn't bring it up.
(boots Recovery HD, Mac OS X Utilities).
No way to load EFI Firmware Update 2.3 onto Macbook.

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'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.

Apple Hardware Test won't load

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