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

Similar Messages

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

Will Not Boot from Install Disc & 4SNS/1/40000000: TG0D - Thermal Sensor?

*Will Not Boot from Install Disc*
I used the "option key" approach with the gray start up disk. At first it ejected the start up disk. Then I nudged the disk back in the machine and it showed on the screen as an option. I clicked on the start up disk image and it finally loaded.
But, it won't accept the start up disk when holding down the "C" key at restart.
*4SNS/1/40000000: TG0D*
I did an Apple Hardware Test and received the following diagnostic:
Version: 3A121
Test Suite: Extended Test
Loop Count: 2
Result: Failed
Failure code: 4SNS/1/40000000: TG0D
*Thermal Sensor*
A search for the failure code 4SNS/1/40000000: TG0D brought up an Apple Discussion topic entry stating: That error code indicates a problem with a thermal sensor. It could be not working or possibly not connected. You will need to take it to Apple for repair.
Would a thermal sensor have anything to do with it not starting up when holding down the "C" key at restart? What are thermal sensor problem symptoms?
*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
I completed a DiskWarrior rebuild on the disk and verify disk shows it is fine.
Any suggestions on what to do next with these issues?

The answer was in your post: "You will need to take it to Apple for repair."

BIOS update, then will not boot from any drive

This old laptop, 3000 C200 8922 was acting very clunky when on wireless.
Downloaded Bios Version 63ET62WW and flashed it into the bios.
Now, even though I can get to the bios screen, and it shows the hard drive, DVD/CD drive, it will NOT boot from either.
It will also "see" a usb installed, but will not boot from it.
I have removed all power and cleared the CMOS several times and I still have nothing. Tried two different hdd's which have been in the machine and same results.
HELP!! I should have never messed with it......

hi k4pew,
One rule after a BIOS update is to Load optimize deafults after updating.
Try that go inside BIOS Hit F9 to load defaults then F10 to Save and Exit.
If not
Try turning on the computer and start hitting F1 to load the Recovery Menu and see if that will push then Try Reseting the PC.
If still the same Im afraid that the BIOS needs to be reflashed.
Im not aware of any flash tool or a your Previous BIOS Version Firmware available for download.
You can try calling Lenovo Technical Support for any options available for repair.
Im sorry to hear what happened
Regards
Solid Cruver
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Will Not Boot From Install Disc

Upon a Verify Disk check I received a "Volume Header needs minor repair" notice.
Because it is necessary to boot from another disc to repair the header, I attempted to boot from the install disc. I tried restarts holding down the "C" or by selecting the start up disc in System Preferences/Startup Disk. I've tried each of the these several times to no avail. The machine will not start from the install disc. It keeps starting from the machine hard drive.
Are there any other suggestions how to force it to start from a startup disk?

The installer disc problem is still a concern but in the meantime you can try booting to Safe Mode. Run Disk Utility again from Safe Mode and see if it still reports problems. Boot normally afterward.
[Mac OS X: Starting up in Safe Mode|http://docs.info.apple.com/article.html?artnum=107393]
[What is Safe Boot, Safe Mode? (Mac OS X)|http://docs.info.apple.com/article.html?artnum=107392]
[Safe Boot takes longer than normal startup|http://docs.info.apple.com/article.html?artnum=107394]
[Mac OS X 10.4, 10.5- Computer shuts down during Safe Boot|http://support.apple.com/kb/TA24054]
Safe boot mode runs a directory check command similar to that used by Disk Utility's repair. In Tiger it ignores some stored information (cache) that is normally read that speeds up the boot process, and it moves some other caches to the trash. It also uses only System fonts and disables all Startup Items, third party items, and any Login Items.

My Mac Mini Will Not Boot From Install Disc For Re-Installation

I've tried all (at least the ones I've found) workarounds to get my Snow Leopard Install Disc to boot, but it will not. When the computer boots normally (without the DVD), I can insert the DVD and access it from there. However, when I try to use the utilities on the disc, it requires a reboot that ends up telling me to turn off my computer. I have a Late 2010 Mac Mini and I have yet to try booting from a disc, so I don't know if this is a new problem or an old one. Any help would be greatly appreciated.

Unplug everything from your computer except a wired keyboard/mouse and the monitor. If your Mini still won't boot from the install DVD try resetting the PRAM and SMC.
Intel-based Macs: Resetting the System Management Controller (SMC)
Resetting your Mac's PRAM and NVRAM
If that doesn't fix the problem remove any RAM (if you upgraded) and replace with the Mini's original RAM. There is also this document you might want to read, Mac OS X: Gray screen appears during startup.
If that all fails I would take the Mini to the Apple store. It should still be under warranty if you bought it late last year.

Will Not Boot from Install Disc | 4SNS/1/40000000: TG0D

I used the "option key" approach with the gray start up disk. At first it ejected the start up disk. Then I nudged the disk back in the machine and it showed on the screen as an option. I clicked on the start up disk image and it finally loaded.
But, it won't accept the start up disk when holding down the "C" key at restart.
I did an Apple Hardware Test and received the following diagnostic:
Version: 3A121
Test Suite: Extended Test
Loop Count: 2
Result: Failed
Failure code: 4SNS/1/40000000: TG0D
A search for the failure code 4SNS/1/40000000: TG0D brought up an Apple Discussion topic entry stating: +That error code indicates a problem with a thermal sensor. It could be not working or possibly not connected. You will need to take it to Apple for repair.+
Would a thermal sensor have anything to do with it not starting up when holding down the "C" key at restart? What are thermal sensor problem symptoms?
The machine also starts up with my user file folder opened up rather than with a blank screen as it normally should
I completed a DiskWarrior rebuild on the disk and verify disk shows it is fine.
Any suggestions on what to do next with these issues?

One guy fixed it by pulling one RAM stick out...
http://forum.notebookreview.com/showthread.php?t=338780
It might mean overheating or worse things too.

My info will not boot up. Stops at the Apple emblem.

My IPhone will not boot up. The apple emblem lights up them fads out. This continues to happen every 15 minutes are so. How do I get the IPhone 4s to boot up?

Try a reset by holding the power and home keys down until the Apple logo appears - 15 to 20 seconds.
Barry

Macbook Pro will not boot from any source after upgrade

Hi,
I have a late 2011 Macbook Pro - standard issue other than more memory as I recall. It has a 750MB hard drive with more than half still free. All the checks given below are done with the computer stand-alone with no hardware attached - other than the power cord and of course WiFi.
2 weeks ago I upgraded to Yosemite having taken all the right precautions before upgrade - thanks to Take Control. It worked fine and I was getting a good experience until last Wednesday when I put it to sleep by closing the lid. Later in the day I opened it up again but only got a grey screen. After leaving it several minutes to see if it cleared I shut down by holding the on button for several seconds then tried to re-boot. The computer starts and gets as far as the grey screen then shuts down again after several minutes. Sometimes it will continue to restart after shut down and keeps doing this until I again hold the on button in until it finally shuts down for good.
I have two bootable drives - one is a cloned backup of the previous version and all the data, the other is an 8GB thumb drive with a bootable version of the Yosemite installer. For the record I also have a Time Machine backup and a second full clone backup and recovery drive on a Synology NAS device - I just haven't figured out how to boot from this device as yet.
I can get to the boot up selection screen (hold option key) and select an external drive to boot from but it makes no difference - I still get the same grey screen. Same thing if I use Command +R to boot from the Mac HD recovery partition.
I have also tried to boot into safe boot mode (hold the shift key down). This seems to slow everything down but ultimately has the same result - a grey screen.The only difference I can see is that this grey screen does not shut down after a time. Seems to just continue until I shut it down manually.
I can hold Command +V to remove the grey screen and see the action being written to the screen while logging on (white text on a blue screen) - up to a point. After some time I just get the same grey screen and it shuts down after more time. I can also use Option +D (I'm told it should be just hold the 'D' key to do this but that has never worked for me and Option +D does) to get to the hardware check and I have run this both before upgrading and after having the problem. Before upgrading I got one error - 4ETC/1/40000002. I looked this up on the Internet and could find nothing specific to identify the problem and the general consensus seemed to be it was nothing major. After upgrading and running the hardware check again (after this problem occurred) it returned no errors.
I have reset the PRAM with the same result as before - all I get is the is the Apple logo and a progress bar that increases to around 50%, then both disappear and I get just a grey screen. After a time the computer shuts down and then restarts again and goes through the same process.
I've done pretty much everything I can think of and find in books and on the Internet. Hoping that someone out there will find this problem interesting and help me to resolve it.
Tony

Problem resolved. I took the machine into an authorized repair facility where, for around $30, I had it checked and the logic board replaced. Picked it up yesterday and seems to be working OK. No cost to replace the logic board even though the machine is over 3 years old. There seems to be some sort of dispute with Apple over a class action that has worked in my favour. Great. I'm happy.
Tony

Holding c while resarting but will not boot from install disc

hello,
I have a G4 Titanium Powerbook currently running os 10.3.9.
I have been having troubles ever since upgrading to Quicktime a while back such as Quicktime not playing files, missing codecs, Pro-Tools and other software crashes, Itunes will not open with M-Box connected, etc.
I have tried to repair permissions with the disk utility and still same issues.
I have backed up all important files and would like to just reinstall the os 10.1 using the disc I got with the powerbook hoping to be able to upgrade back to 10.3.9.
I have tried to shutdown with the disk in and turn on with the c button pressed and it still boots up as usual.
I have also tried to restart holding c and still boots up as usual. I just cannot seem to get the powerbook to boot from the install disc.
The disc is the powerbook g4 mac osx 10.1 install disc.
What am I doing wrong?

i have the following discs.
mac osx install - which is 10.1
mac os9 install
software restore 1
software restore 2
mac osx developer tools
I have tried to boot by holding c with the mac osx install and the software restore 1 discs to no avail
I just tried to put itunes on the desktop run disc utility trash itunes reciepts and repaired permissions and got this messege which i seem to get every time but am still having issues.
Repairing permissions for “Macintosh HD”
Determining correct file permissions.
We are using special permissions for the file or directory ./Library/ColorSync/Profiles/Displays. New permissions are 16893
We are using special permissions for the file or directory ./Library/ColorSync/Profiles. New permissions are 16893
We are using special permissions for the file or directory ./System/Library/Filesystems/cd9660.fs/cd9660.util. New permissions are 33261
We are using a special uid for the file or directory ./private/var/at/jobs. New uid is 1
We are using a special uid for the file or directory ./private/var/at/spool. New uid is 1
The privileges have been verified or repaired on the selected volume
Permissions repair complete
I just really want a clean install. help please
powerbook G4 Mac OS X (10.3.9)

I changed the cracked screen on my 3gs, and screen works but it will not boot up and go past the Apple screen.

I tried recovery at least three times, and it says that it can not complete the activation at this time. I did take my Sim card out and try as well, because I had to use it in my old phone. I reopened the phone and double checked that everything was plugged back in from the screen change. What went wrong??? I restored it before and everything worked fine. It's not hacked or jailbroke, so I don't know what's going on???? Please help!

Yes, i did. I bought a screen repair kit and it was very simple to change. it works, but its stuck in recovery mode...

Advice for troubleshooting an emac that will not boot

My mom's emac will not boot, and gets stuck with a gray screen and apple logo along with the circling timer. We have tried the following:
(OSX.2x)
turning off and unplugging computer.
removed all peripherals
reboot in safe mode
reboot from installation disc
nothing works. The computer gets stuck in the boot process. We have run the hardware repair disc, there are no problems with the hardware.
I would like to make as many attempts to troubleshoot problem at home before spending a lot of money by taking it to a repair shop. I would also like some information before I go in order to be prepared to discuss the problem. I do not want to get 'taken' for repairs that may be unnecessary.
Any guidance, suggestions, advice would be very helpful and greatly appreciated.
Thanks!
emac Mac OS X (10.2.x)
Mac OS X (10.2.x)

It sounds as if you've already figured the standard trobleshooting / startup methods. There is one additional thing that can block an eMac from starting: if the PRAM battery is failing, that can prevent the Mac from starting up. My understanding is that a failed battery would block the eMac from starting up to the Apple Hardware Test (AHT) Disk also, through. Perhaps the battery is low enough to prevent a normal start but still has enough in it to let AHT come up? If you have an electronics multimeter, you can test the battery while it's under load (i.e., still in the eMac's PRAM battery holder) and see if it's within 0.1v of the nominal 3.6v specification. If the battery is low, replacing it is straightforward (see eMac - Do-It-Yourself). The 1/2 AA 3.6v lithium battery is available online and is usually in stock at places like Radio Shack, where it costs about US$11 or so (the battery is cheaper online, but after adding shipping and handling, the brick-and-motar store is about the same, plus quicker).

Mid-2009 MacBook Pro sees internal SATA hard drive, but will not boot from or format

I inherited a Mid-2009 MacBook Pro (15-inch, 2.53 GHz model) with a very strange issue.
It first presented itself as not being able to boot from the internal SATA hard drive that came with the computer. Nothing I tried could get it to boot, so I assumed the file system was corrupted beyond repair and booted from a CD to try to format the drive. Disk Utility on the CD would not format the drive, giving me strange error messages like "Unable to write to the last block of the device".
At this point I figured the drive itself must be toast, so I pulled it out and put another known-good SATA hard drive in, booted from CD, and attempted to format. Again, same error messages and an unsuccesful format.
So I had the bright idea of formatting one of the drives in an external enclosure and then putting it in the MBP to see if OS X would even install. No dice. Get a cryptic error message before installation even begins.
So I installed OS X on the drive in the external enclosure and put it in the MBP, and it attempts to boot, but never goes anywhere.
So to sum up, the symptoms I'm seeing:
MacBook Pro CAN see internal SATA hard drives.
MacBook Pro WILL NOT boot from any internal SATA hard drive and cannot format or install OS X to any internal SATA hard drive.
MacBook Pro WILL boot from any CD or external device and seems to work properly otherwise.
At this point I'm thinking it's one of two things: the hard drive ribbon cable or the SATA controller on the logic board.
Since the MacBook Pro seems to work completely fine other than this one issue, and will boot properly from both external devices and the CD (also a SATA device), I'm thinking and hoping that it's just the hard drive ribbon cable. From my searches online, I've heard that this batch of MacBook Pros is known to have issues with the hard drive ribbon cable, but it seems in most cases this manifests itself by the Mac not being able to see a drive at all.
I've done quite a bit of troubleshooting to get to this point, but right now I'm just looking for any feedback at all. Specifically I'd love to know a way I can easily test to see whether it's the logic board or the cable.

UPDATE: An interesting development!
I just tried a third known-good SATA hard drive, one which I believe supports SATA I only (but I'm not sure), and unlike the other drives that the Mac sees but cannot properly interact with, the Mac can't even see this one when I put it inside.
Frustrating as this may be, I believe I'm actually getting closer to a solution since my symptoms now appear to be closely aligned with people having SATA ribbon cable issues.
Onward!

IBook G3 will not boot from CD/DVD

Ok, I have an iBook G3.
I was restoring it to factory with the Software Restore disks which came with the unit as I was planning to move on to a new unit.. But there was a power cut in the middle of the process and the unit shut off. Now, it does not recognise a HD when booting holding option.
It also will not boot from any CD/DVD other than the Apple HW Test disk provided with the unit.. All other disks spin up and then get ejected, on the odd occasion it does not eject, it boots to a icon of a floppy diskette with a flashing ? (Saying that, I did manage to get it to load from the restore disk 1 once, but it just said it could not mount the image file)
The HW test disk returns no problems
I have reset PRAM multiple times, and reset nvram and all in Open Firmware. I have also reset PMU as a last resort, but no luck
Any ideas?

Hi, and welcome to Apple Discussions.
Do you have DiskWarrior, maybe?

I am in mavericks disk utility recovery mode as my mac book will not boot up & stays only on the grey apple screen. When I verify the disk I get open error5 :input /output error on Syst stuck on 1 minute pouring out over 50 error messages & still counting

I am in Mavericks disk utility recovery mode as my mac book pro will not boot up & stays on the Apple grey screen . When I verify disk permissions I get
Open error 5:"input/ output error" on syst with over 50 of this messages & still counting . Disk Utility says 1 minute
But this has been going on for over 10 mins .
I can not verify disk or repair disk .
I have tried to reinstall mavericks operating system but it says my hard drive is locked which is very strange .
Does anyone know what is going on here ?
My system looks like it has been totally corrupted . Thanks Andrew

Could be. The "lock" isn't actually looking for a password.
WARNING: This will completely erase the ENTIRE hard drive.
What you would need to do is boot to recovery > disk utility > select the MAIN drive on the left side > partition > change partition layout from CURRENT to 1 PARTITION > ensure on the right side it says Format : Mac OSX Extended (Journaled) then push APPLY.
Then if it will allow us, close the windows until you see the 4 options popup again and select "Reinstall Mac OS X" select the Mac HD and you should be good to go!

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

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