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

Similar Messages

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

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

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?

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 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

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

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 Apple Hardware Test won't stop

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