IMac not booting from HD, cannot repair disc in Disk Utility

First the problem:
I've had the imac G5 for nearly two years and its been running without a problem, now it suddenly wouldn't start up. Firstly I get two or three grey screens in succession looking as if being drawn from top to bottom very quickly, then the apple logo and timer, after a minute or so the fans start up to full power and it stays that way.
What I've tried:
Reading around discussions I tried rebooting from DVD installer and using disk utility. Result: error message: The underlying task reported failure on exit. 1 volume could not be repaired because of an error.
Because I want to sell the imac I had backed up all of my important data so I zero-wrote the hard drive in preferrence to buying a third party repair package. Reinstalled from DVD. Shut down and restarted. Everything worked except those banding grey screens appeared that were never there before. Something looks wrong. Then when i tried to reinstall microsoft office (as a test) the OS seemed to freeze and I had to shut it down again. Now it won't boot up as before. This looks like a very serious problem.
I hesitate to buy tech tool pro in case that doesn't solve it either.
Can't think if I did something to cause this. All I've been doing is transferring some data via ethernet to a newer mac. There was also a Lacie firewire drive linked to both computers as i was backing up stuff. One night I shut the iMac down and the next day it started with this problem.
Well... any educated suggestions would be most welcome,
thanks.
By the way, the memory in the mac was purchsed from a third party and installed ages ago by myself. Never been a problem with it and have been running Final Cut Studio no trouble.
iMac G5 2GHz Mac OS X (10.4.7) RAM 2GB

Long story short, I had the same problem last week, just after installing the latest software updates. I went through all the resets and disk utility verification (multiple times with phone support -- Apple Care), then took it to the local Apple store b/c nothing worked. They couldn't figure it out either and recommended that I try to backup my data on my bootable external drive before they started messing with my hard drive, since Apple stopped providing this service. I brought it home, could not boot from my external drive, so booted from the disk again, just for kicks I ran the same verification process (this was the 3rd or 4th time). This time something happened but it still failed. So I ran it three more times (each time something new happened and then it failed, until the third time when everything worked. The only problem now is that I seem to have lost all sound???? I did immediately make a duplicate of the Imac hard drive. Any thoughts on how to get my sound back? hope this helps....
Imac G5 20" Mac OS X (10.4.9)

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Can anyone point me in the right direction as I am at a loss at the moment and have no further idea's of my own.

n0der,Welcome to Apple Discussions.
Is the Optical drive known good? can you read other disks?
If not do you have another Mac you could use Target Disk Mode on and hence use that Mac's optical drive rather than the iMac's internal...
Does Apple Hardware Test CD report any faults or will it not boot from that either?
mrtotes

IMac not booting from Leopard Disk

I have been given the task of helping out a friend who has recently inherited a 20" Aluminium iMac from some late family members. The machine has a password to get in which he doesn't know but other than that it boots as far as the login screen fine. I tried to get it to boot from my Leopard disk and it just reboots instead of launching OS X from the DVD. I've run a hardware check and everything is reported as running fine (although I did leave it doing a full one last night, so i'll post any updates if there are any). Does anyone know what might be the problem?
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I've tried holding down cmd,alt,shift,del but it seems to just ignore this key combination
I'm using an old white keyboard and a USB mouse as the ones that came with it are wireless.
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It's quite possible that your retail Leopard DVD predates the release of the iMac and so lacks the necessary drivers for the newer hardware. Ask your friend if he got the disks that came with the iMac and if so use that disk set. If he didn't get them, identify the exact iMac model:
http://support.apple.com/kb/HT1758
Then you can look here:
http://support.apple.com/kb/HT1159
and see what version of Leopard came with the iMac. If your retail disk is earlier than the version that came with the iMac, it won't work. You'll need a later version of the retail disk (if available) or your friend will need to contact Apple tech support and see if he can order a replacement disk set for the iMac.
Hope this helps.

Computer will not boot up. I have tried running disk utility and re-installing OSX. It says disk locked

I am new to Macs and have bought a 13" Macbook Pro and a IMac 21.5" 14 months ago. I have only used the Macbook pro about 15-20 times and after upgrading to Maverick it will not boot up. I get the white screen and a spinning circle. I have tried Disk utility repair and even re-installing the OSX, but it says disk locked. I do not recall setting any password protections or passwords. I now have a brick with a lit up Apple logo. If anyone knows how I can bypass the disk lock error or reset the laptop, please let me know. This has not been a pleasant conversion from PC's. Even my IMac blacks out from time to time and both happened right after my factory warranty expired.

The internal drive is malfunctioning. Make a "Genius" appointment at an Apple Store, or go to another authorized service provider.
Back up all data on the internal drive(s) before you hand over your computer to anyone. There are ways to back up a computer that isn't fully functional — ask if you need guidance.
If privacy is a concern, erase the data partition(s) with the option to write zeros* (do this only if you have at least two complete, independent backups, and you know how to restore to an empty drive from any of them.) Don’t erase the recovery partition, if present.
Keeping your confidential data secure during hardware repair
*An SSD doesn't need to be zeroed.

My MacBook Pro mid-2009 will not restart after a failed repair attempt in Disk Utility

After attempting to repair my MacBook Pro in Disk Utility (Ctrl-R recovery mode), I tried rebooting with no success. Then I tried to re-boot in Safe Mode with the same result - basically, the progress bar goes to about halfway and then the computer shuts down. Then, I tried leaving it overnight with no activity and trying to re-boot in the morning. Still had the same result.
I would just re-install Mountain Lion, but I have some recent pictures and videos that aren't backed up yet.
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You can install OS X on a external powered drive and boot the computer from it, then access your user files folders for recovery then erase and install from the Internet Recovery (command option r) or the 10.6 install disks, then upgrade again in AppStore, then restore your files.
.Create a data recovery/undelete external boot drive

My MacBook is hung up on "safe boot mood" and shuts off. I have tried everything on this site to fix and no go. Will not boot from external start up disc either. Any help, please.

I also just installed 10.6.3 Leopard.

Hey Don, did you try to shut down the MBP (if necessary by forcing it to, done by keeping the power button pressed for more than 5 seconds) and then restarting while keeping the Command-button pressed to bring up the available boot disks, then select the install CD?
Maybe it lost power during installation and thus the HDD is shot. Did you back up before doing the new install? Do you have a second Mac you can connect the MBP via Firewire to, which means you could try target disc mode (press T and keep it pressed during startup)?

IMac not booting from retail Leopard DVD.

I am silly and posted in the wrong forum. This is the link to my problem: http://discussions.apple.com/thread.jspa?threadID=1795309&stqc=true
Edited by Max Maxwell

Moderators may have moved your previous post, as it is no longer accessible.

Imac g5 ALS will not boot from internal HD or portable drive or eject disc

I cannot get my g5 ambient light sensor Imac to boot from the internal hard drive or a portable drive. I have tried multiple keystroke combinations (c + power on, option + power on, and others) upon startup and all get the same response: the computer powers on and the screen displays the apple logo. after a minute or two, the screen darkens, and a multilingual message appears telling me that I need to restart the computer. I cannot get far enough to start from a different drive or a system software disk. I cannot eject the disc currently in the drive. I cannot run any diagnostic software, cannot reinstall system software or put another disc in the drive. obviously, I am experiencing hard drive problems, but I cannot seem to get past this frustrating stumbling block. any troubleshooting or problem solving would be greatly appreciated. I have checked other discussions and support forums, but cannot find any that reference the specifics that I have mentioned. I have researched and tried the logic board check and many other potential "solutions", but none of the discussions mention the gray screen "you must restart your computer" message that I continually receive.

What you are experiencing is called a Kernel Panic.
First, to get the disc out of the drive, hold the mouse button down as you reboot.
Have you tried resetting the SMU?
1. Turn off the computer by choosing Shut Down from the Apple menu, or by holding the power button until the computer turns off.
2. Unplug all cables from the computer, including the power cord.
3. Wait 10 seconds.
4. Plug in the power cord while simultaneously pressing and holding the power button on the back of the computer.
5. Let go of the power button.
6. Press the power button once more to start up your iMac.
Then try booting from your install disc and running Disk Utility:
1. Insert the Mac OS X Install disc that came with your computer, then restart the computer while holding the C key.
2. When your computer finishes starting up from the disc, choose Disk Utility from the Installer menu. (In Mac OS X 10.4 or later, you must select your language first.)
Important: Do not click Continue in the first screen of the Installer. If you do, you must restart from the disc again to access Disk Utility.
3. Click the First Aid tab.
4. Click the disclosure triangle to the left of the hard drive icon to display the names of your hard disk volumes and partitions.
5. Select your Mac OS X volume.
6. Click Repair. Disk Utility checks and repairs the disk.
Please post back with results,

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Hi guys,
Just been working on iMac, forget the exact spec but it's a 24" Intel 2.something Core 2 Duo or whatever it is, 4gb DDR2 RAM, gotta be about 2 years old to the day and after my last 2 Macs have lasted forever, never developing a fault, I didn't take out Applecare... Perhaps I had a bit too much faith...
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Will Not Boot from Install Disc & 4SNS/1/40000000: TG0D - Thermal Sensor?

*Will Not Boot from Install Disc*
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*4SNS/1/40000000: TG0D*
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*User File Folder Opened Up*
The machine also starts up with my user file folder opened up rather than with a blank screen as it normally should
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The answer was in your post: "You will need to take it to Apple for repair."

Can not boot from OSX disc

I recently partitioned my internal drive with an 80 gig partition to run Ubuntu , removed Ubuntu and now can not resize hd to recover the 80 gig that I used , there was a program with this Ubuntu install called rEFIt that was installed for the dual boot , My problem is that Itunes keeps crashing and I have spent somewhere around 8 hours trying to fix this issue and in the process I discovered that I now can not boot from the osx disc but I can boot from the Ubuntu disc , what can I do to correct this issue or is there anything that I can do to correct this and recover the 80 gig that I used ?

The only solution was to erase hd and restore from time machine backup......
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IMac will not boot from any mode except Target Disk

I have an Early 2008 Penryn iMac 24" MB398LL/A running OS X 10.7.4 (see specs below) that will not boot from ANY mode, It also has several strange vertical bars from top to bottom on the screen. They are about 10 px wide, with some pixels empty and looks a bit like a barcode if you squint at it.
I have tried Safe Boot, Force Boot, DVD Boot, FireWire/USB Boot, and it always gets to the same point. It gets to the apple screen with the spinning gear and then after about 8 seconds it freezes. The only way it works at all is in Target Disk Mode. It pops right up on my Macbook Pro and I was able to grab all my info!
I have run Disc Utilities and Tech Tool on it many times from my MBP and it passes every test.
I reformatted the HD and installed 10.7 again, it still freezes up at the same point.
I have tried using Single User mode and every time have had to run /sbin/fsck -fy twice because it always says the disk is ok but it was modified on the first pass.
I thought maybe it had a bad video card or logic board but and I ran the Apple Hardware Test on many occasions and it always passes. Recently I was told about Loop Mode and just completed running the AHT for just over 30 hours without any errors at all.
UPDATE...
Strange Part… I tried installing Mountain Lion in Target Disk Mode and everything went smoothly. When it restarted on its own the lines on the screen were gone for the moment, but the Mac still freezes up on the spinning gear and immediately restarts on its own. I have run every thing listed above on it and still nothing. Sometimes the lines reappear then in two more starts they are gone.
I did manage to have it start one time got a copy of the the error report (its at the bottom too) The Mac ran for at least 30 minutes with no problems, then the screen went crazy a few seconds and it became unresponsive. The mouse moved but that was all it could do. Now my iMac continually restarts itself, I don't have any more ideas, HELP!
Specs...
The iMac "Core 2 Duo" 3.06 24-Inch Aluminum (Early 2008/Penryn) features a 3.06 GHz Intel "Core 2 Duo" processor (E8435), with two independent processor "cores" on a single silicon chip, a 6 MB shared level 2 cache, a 1066 MHz system bus, 2 GB of RAM (800 MHz DDR2 SDRAM, PC2-6400), a 500 GB (7200 RPM) Serial ATA hard drive, a vertically-mounted slot-loading DVD±R DL "SuperDrive", NVIDIA GeForce 8800 GS graphics acceleration with 512 MB of GDDR3 memory, a built-in iSight video camera, and built-in stereo speakers underneath the 24" glossy TFT Active Matrix LCD (1920x1200 native) display.
Error Report…
Sat Sep 1 17:13:12 2012
panic(cpu 0 caller 0xffffff801a4b7b95): Kernel trap at 0xffffff7f9bab8654, type 14=page fault, registers:
CR0: 0x000000008001003b, CR2: 0x0000000000000010, CR3: 0x0000000011803000, CR4: 0x0000000000000660
RAX: 0x0000000000000001, RBX: 0xffffff8050e00000, RCX: 0xffffff801aa8eb00, RDX: 0xffffff80602dba38
RSP: 0xffffff80602dbb60, RBP: 0xffffff80602dbb60, RSI: 0x0000000000000000, RDI: 0x0000000000000000
R8: 0x0000000000000000, R9: 0x00000000000000ff, R10: 0xffffffffffffffff, R11: 0x00000000ffffffff
R12: 0xffffff8050e00000, R13: 0x0000000000000000, R14: 0x0000000000000002, R15: 0x0000000000000000
RFL: 0x0000000000010246, RIP: 0xffffff7f9bab8654, CS: 0x0000000000000008, SS: 0x0000000000000010
Fault CR2: 0x0000000000000010, Error code: 0x0000000000000000, Fault CPU: 0x0

Here is the complete error log...
Sat Sep 1 17:13:12 2012
panic(cpu 0 caller 0xffffff801a4b7b95): Kernel trap at 0xffffff7f9bab8654, type 14=page fault, registers:
CR0: 0x000000008001003b, CR2: 0x0000000000000010, CR3: 0x0000000011803000, CR4: 0x0000000000000660
RAX: 0x0000000000000001, RBX: 0xffffff8050e00000, RCX: 0xffffff801aa8eb00, RDX: 0xffffff80602dba38
RSP: 0xffffff80602dbb60, RBP: 0xffffff80602dbb60, RSI: 0x0000000000000000, RDI: 0x0000000000000000
R8: 0x0000000000000000, R9: 0x00000000000000ff, R10: 0xffffffffffffffff, R11: 0x00000000ffffffff
R12: 0xffffff8050e00000, R13: 0x0000000000000000, R14: 0x0000000000000002, R15: 0x0000000000000000
RFL: 0x0000000000010246, RIP: 0xffffff7f9bab8654, CS: 0x0000000000000008, SS: 0x0000000000000010
Fault CR2: 0x0000000000000010, Error code: 0x0000000000000000, Fault CPU: 0x0
Backtrace (CPU 0), Frame : Return Address
0xffffff80602db800 : 0xffffff801a41d5f6
0xffffff80602db870 : 0xffffff801a4b7b95
0xffffff80602dba40 : 0xffffff801a4ce4ad
0xffffff80602dba60 : 0xffffff7f9bab8654
0xffffff80602dbb60 : 0xffffff7f9baa218c
0xffffff80602dbbb0 : 0xffffff7f9baa20e2
0xffffff80602dbbd0 : 0xffffff7f9ba73554
0xffffff80602dbc00 : 0xffffff7f9aa8d470
0xffffff80602dbc40 : 0xffffff7f9aa8d3df
0xffffff80602dbc60 : 0xffffff7f9aa926ec
0xffffff80602dbcf0 : 0xffffff7f9aa8af20
0xffffff80602dbd20 : 0xffffff7f9aadacc7
0xffffff80602dbd70 : 0xffffff801a833b9b
0xffffff80602dbdc0 : 0xffffff801a862d57
0xffffff80602dbe30 : 0xffffff801a497cef
0xffffff80602dbe80 : 0xffffff801a420abd
0xffffff80602dbeb0 : 0xffffff801a410448
0xffffff80602dbf00 : 0xffffff801a4195fb
0xffffff80602dbf70 : 0xffffff801a4a5ad6
0xffffff80602dbfb0 : 0xffffff801a4ced13
      Kernel Extensions in backtrace:
         com.apple.iokit.IOGraphicsFamily(2.3.4)[2600903C-EEDE-321B-A023-169DC9B26EA6]@0 xffffff7f9aa81000->0xffffff7f9aab8fff
            dependency: com.apple.iokit.IOPCIFamily(2.7)[8C9E06A4-13D0-33F5-A377-9E36F0ECC229]@0xffffff 7f9aa4d000
         com.apple.NVDAResman(8.0)[6A699209-FB98-316B-A3C0-DCA82AA8C86B]@0xffffff7f9aad8 000->0xffffff7f9addafff
            dependency: com.apple.iokit.IOPCIFamily(2.7)[8C9E06A4-13D0-33F5-A377-9E36F0ECC229]@0xffffff 7f9aa4d000
            dependency: com.apple.iokit.IONDRVSupport(2.3.4)[99CA4184-8D92-31B2-8726-46139E8E3DFF]@0xff ffff7f9aac4000
            dependency: com.apple.iokit.IOGraphicsFamily(2.3.4)[2600903C-EEDE-321B-A023-169DC9B26EA6]@0 xffffff7f9aa81000
         com.apple.GeForce(8.0)[4B9BE287-5251-398E-96B0-BB16C9BFB2D9]@0xffffff7f9ba72000 ->0xffffff7f9bb34fff
            dependency: com.apple.NVDAResman(8.0.0)[6A699209-FB98-316B-A3C0-DCA82AA8C86B]@0xffffff7f9aa d8000
            dependency: com.apple.iokit.IONDRVSupport(2.3.4)[99CA4184-8D92-31B2-8726-46139E8E3DFF]@0xff ffff7f9aac4000
            dependency: com.apple.iokit.IOPCIFamily(2.7)[8C9E06A4-13D0-33F5-A377-9E36F0ECC229]@0xffffff 7f9aa4d000
            dependency: com.apple.iokit.IOGraphicsFamily(2.3.4)[2600903C-EEDE-321B-A023-169DC9B26EA6]@0 xffffff7f9aa81000
BSD process name corresponding to current thread: WindowServer
Mac OS version:
12B19
Kernel version:
Darwin Kernel Version 12.1.0: Tue Aug 14 13:29:55 PDT 2012; root:xnu-2050.9.2~1/RELEASE_X86_64
Kernel UUID: 3005059E-270B-3B9F-940D-7A66C05DDC9D
Kernel slide:     0x000000001a200000
Kernel text base: 0xffffff801a400000
System model name: iMac8,1 (Mac-F227BEC8)
System uptime in nanoseconds: 26349024446
last loaded kext at 22534854703: com.apple.driver.AppleHDAHardwareConfigDriver          2.3.0f2 (addr 0xffffff7f9c489000, size 12288)
loaded kexts:
com.apple.driver.AppleHDAHardwareConfigDriver          2.3.0f2
com.apple.driver.AppleHDA          2.3.0f2
com.apple.driver.AppleTyMCEDriver          1.0.2d2
com.apple.filesystems.autofs          3.0
com.apple.iokit.IOBluetoothSerialManager          4.0.9f8
com.apple.iokit.IOBluetoothUSBDFU          4.0.9f8
com.apple.driver.AppleLPC          1.6.0
com.apple.driver.AppleMuxControl          3.2.6
com.apple.driver.AppleBacklight          170.2.3
com.apple.driver.AppleUpstreamUserClient          3.5.10
com.apple.driver.AppleMCCSControl          1.0.33
com.apple.GeForce          8.0.0
com.apple.driver.AppleSMCPDRC          1.0.0
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.ACPI_SMC_PlatformPlugin          1.0.0
com.apple.driver.AppleIRController          320.15
com.apple.iokit.SCSITaskUserClient          3.5.1
com.apple.driver.AppleFileSystemDriver          3.0.1
com.apple.AppleFSCompression.AppleFSCompressionTypeDataless          1.0.0d1
com.apple.AppleFSCompression.AppleFSCompressionTypeZlib          1.0.0d1
com.apple.BootCache          34
com.apple.driver.XsanFilter          404
com.apple.iokit.IOAHCIBlockStorage          2.2.1
com.apple.driver.AppleFWOHCI          4.9.5
com.apple.driver.AppleUSBHub          5.1.6
com.apple.driver.AirPortBrcm43224          600.36.17
com.apple.iokit.AppleYukon2          3.2.3b1
com.apple.driver.AppleAHCIPort          2.4.0
com.apple.driver.AppleIntelPIIXATA          2.5.1
com.apple.driver.AppleUSBEHCI          5.1.5
com.apple.driver.AppleUSBUHCI          5.1.5
com.apple.driver.AppleEFINVRAM          1.6.1
com.apple.driver.AppleRTC          1.5
com.apple.driver.AppleHPET          1.7
com.apple.driver.AppleACPIButtons          1.6
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.driver.DspFuncLib          2.3.0f2
com.apple.iokit.IOAudioFamily          1.8.9fc9
com.apple.kext.OSvKernDSPLib          1.6
com.apple.kext.triggers          1.0
com.apple.iokit.IOSerialFamily          10.0.6
com.apple.driver.AppleSMBusPCI          1.0.10d0
com.apple.driver.AppleBacklightExpert          1.0.4
com.apple.driver.AppleSMBusController          1.0.10d0
com.apple.nvidia.nv50hal          8.0.0
com.apple.NVDAResman          8.0.0
com.apple.iokit.IOFireWireIP          2.2.5
com.apple.driver.AppleHDAController          2.3.0f2
com.apple.iokit.IOHDAFamily          2.3.0f2
com.apple.iokit.IOSurface          86.0.2
com.apple.iokit.IOBluetoothFamily          4.0.9f8
com.apple.driver.AppleGraphicsControl          3.2.6
com.apple.iokit.IONDRVSupport          2.3.4
com.apple.iokit.IOGraphicsFamily          2.3.4
com.apple.driver.AppleSMC          3.1.3d11
com.apple.driver.IOPlatformPluginLegacy          1.0.0
com.apple.driver.IOPlatformPluginFamily          5.2.0d16
com.apple.iokit.IOUSBHIDDriver          5.0.0
com.apple.driver.AppleUSBMergeNub          5.1.5
com.apple.driver.AppleUSBComposite          5.0.0
com.apple.iokit.IOSCSIMultimediaCommandsDevice          3.5.1
com.apple.iokit.IOBDStorageFamily          1.7
com.apple.iokit.IODVDStorageFamily          1.7.1
com.apple.iokit.IOCDStorageFamily          1.7.1
com.apple.iokit.IOATAPIProtocolTransport          3.5.0
com.apple.iokit.IOSCSIArchitectureModelFamily          3.5.1
com.apple.iokit.IOFireWireFamily          4.5.5
com.apple.iokit.IOUSBUserClient          5.0.0
com.apple.iokit.IO80211Family          500.15
com.apple.iokit.IONetworkingFamily          3.0
com.apple.iokit.IOAHCIFamily          2.2.0
com.apple.iokit.IOATAFamily          2.5.1
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: iMac8,1, BootROM IM81.00C1.B00, 2 processors, Intel Core 2 Duo, 3.06 GHz, 2 GB, SMC 1.30f1
Graphics: NVIDIA GeForce 8800 GS, NVIDIA GeForce 8800 GS, PCIe, 512 MB
Memory Module: BANK 0/DIMM0, 1 GB, DDR2 SDRAM, 800 MHz, 0x2C00000000000000, 0x38485446313238363448445A2D3830304531
Memory Module: BANK 1/DIMM1, 1 GB, DDR2 SDRAM, 800 MHz, 0x2C00000000000000, 0x38485446313238363448445A2D3830304531
AirPort: spairport_wireless_card_type_airport_extreme (0x14E4, 0x8C), Broadcom BCM43xx 1.0 (5.10.131.36.16)
Bluetooth: Version 4.0.9f8 10405, 2 service, 18 devices, 1 incoming serial ports
Serial ATA Device: WDC WD5000AAKS-40YGA1, 500.11 GB
Parallel ATA Device: MATSHITADVD-R   UJ-875
USB Device: Built-in iSight, apple_vendor_id, 0x8502, 0xfd400000 / 2
USB Device: BRCM2046 Hub, 0x0a5c (Broadcom Corp.), 0x4500, 0x1a100000 / 2
USB Device: Bluetooth USB Host Controller, apple_vendor_id, 0x820f, 0x1a110000 / 5
USB Device: IR Receiver, apple_vendor_id, 0x8242, 0x5d100000 / 2
USB Device: Hub in Apple Extended USB Keyboard, apple_vendor_id, 0x1002, 0x1d100000 / 2
USB Device: Trackball, 0x046d (Logitech Inc.), 0xc404, 0x1d120000 / 4
USB Device: Apple Extended USB Keyboard, apple_vendor_id, 0x0204, 0x1d110000 / 3

G4 that will not boot from any disc EXCEPT the Apple Hardware Test CD

We have a DP 1ghz Quicksilver PowerMac G4 that will not boot from any disc EXCEPT the Apple Hardware Test CD that came with the machine.
We were in the process of installing 10.4 Tiger before placing it for sale.
The Mac was originally OSX Server 10.1 that we later converted to a worksation running 10.3 Panther.
It has 1 GB of memory, 80GB hardrive, 250MB Zip Drive and a Radeon 7500 video card.
Since this machine only has a CD-R drive and not a DVD-R, we installed Tiger using another Mac via Target Disk Mode. The installation process went well, but when I tried to reboot I got a Kernel Panic right after startup screen with the grey Apple logo.
On some reboots we get to the blue startup screen, others it stops at the grey Apple logo, others a black box like the a Kernel Panic - but with no text. Twice it went directly into Open Firmware.
We have done the following during our troubleshooting:
- Reseat RAM, Video Card, Hard Drive, Zip & CD-R connections
- Remove RAM 1 stick at a time and reboot
- Replace RAM with RAM from another working Quicksilver
- Replace Video Card with one from another working Quicksilver
- Zap PRAM
- Reset CUDA switch
- Unplug the MAC and remove everything (RAM, Battery, etc) for 30 minutes and try to reboot
- Tried booting from the Macintosh Server G4 Software Restore CD
- Tried booting from Mac OS X Server CD
- Tried booting from AppleCare Protection Plan CD with TechTool
- Tried booting from Diskwarrior CD
- Tried booting from an external FireWire drive with a disk image of Tiger OS Install
- Tried booting with the hard drive disconnected
The Mac WILL boot from the Apple Hardware Test CD and will pass ALL of the extended tests.

Conventional wisdom says that any Mac that will not boot up from a System/Install CD OS 9 or an Install CD Mac OS X, has a Hardware problem.
The diagnostic CD is a red herring because it uses a very primitive method of reading the CD, and so does not properly represent the machines general ability to read CDs.
I would look at the CD drive cables, etc, and see if another drive gives different results.
You have not mentioned using the Startup Manager (option key at Startup) to do any checking:
HT1310- Startup Manager: How to select a startup volume

Imac 21" mid 2011 can not boot from USB device?

Hi,
hope someone can help me.
Bought the new imac 21" and replaced the superdrive with a ssd drive.
Works great but it seems that the imac is not able to boot from any usb device.
I put my osx install disk in my external dvd drive and powered my mac.
While booting up (pressing cmd) the mac does not recognize my external dvd drive. This works great with my MBP late 2008. But the imac can not boot from the dvd drive. Also pressing "c" while booting does not work. Doing that a grey screen appears and after some time mac boots from hdd.
So i installed mac os via target mode over firewire withbmy old imac. This works.
But now i want to install windows on a bootcamp partition.
I can't boot from the windows 7 professional dvd, too. So i tried to create a bootable win 7 thumbdrive. Mac can't boot from this too. Reading many threads in some forum i tried with rEEfit. Reefit shows the usb thumbdrive whike booting, but using this will end in a black screen error from bios: "no bootable device....". Tried a knoppix on the usb thukbdrive, too.... No bootable device....
It seems that there is no way to boot from ANY external usb device like dvd drives or thumbdrives......
What more can i do? I tried for 2 evenings now, but nothing worked out for me......
Currently i don't see any any to install win 7 without an internal superdrive, but can this be??
Thanks for any comments.
Kwicks

Internal is definitely the easiest but you can boot from external HD or external optical drive, the mac is just very picky on what works and what doesn't.
For an external drive or usb stick it has to be GUID partition table and have 10.4.5 or better installed on it, for more info check this link out ( http://support.apple.com/kb/ht1948 )
Hope this helps,
Joe

I have a mid-2010 27" Quad Core i5 iMac running 10.8.3. Startup disk recognizes the primary hard drive as a startup volume but will not boot from it. Have tried zapping PRAM, ran disk utility. No errors reported Any thoughts?

I have a mid-2010 27" Quad Core i5 iMac running 10.8.3. Startup disk recognizes the primary hard drive as a startup volume but will not boot from it. Have tried zapping PRAM, ran disk utility. No errors reported Any thoughts?

My bad Eric. The startup preference recognizes the primary as a 10.8.3 startup volume but when u select it the system does not boot. I can only boot from my external backup drive

IMac not booting from HD, cannot repair disc in Disk Utility

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