14 Replies Latest reply: Jan 17, 2008 12:44 PM by tasharanee
Duncan MacLaren Level 1 Level 1 (0 points)
Ok. I press the on button.

It makes the welcome sound.

The grey screen comes up with the apple logo.

A minute later the Fan goes crazy.

The End.

(I've tried holding down command, option 'P' and 'R' after switching it on.)

Has anyone been through this and mended the issue?



iMac G5, Mac OS X (10.4.6)
  • Dale Weisshaar Level 6 Level 6 (15,865 points)

    Try using Disk Utility to do a Disk Repair, as shown in this link, while booted up on your install disk.
    You could have some directory corruption. Let us know what errors Disk Utility reports and if DU was able to repair them.

     Cheers! DALE

  • Duncan MacLaren Level 1 Level 1 (0 points)
    Hi Dale, and thanks for the advice.

    Basically I started from scratch. I went into DU and erased and restored my mac from the install disk. So far so good. So then I started downloading Mac osx updates from the mac website to be up to date with everything. After installing 10.4.8 (skipping a few versions), the next day I woke it from its sleep only to find it wasn't responding.

    After ages of trying to start it up again I decided maybe to erase and install all over again. When I run the DU, and says pick a volume, it only recognises that I have the install disk and the cd writer its been loaded into. There is no main hard drive for me to run repairs on!

    After restarting it, I held down 'option' to run an apple hardware test. I did the extensive test and it found no errors with anything.

    So now I can't do anything!

  • Baby Boomer (USofA) Level 9 Level 9 (56,960 points)
    If you have any of the following, suggest that you boot from same.
    Highly recommended for *directory damage* repairs.

    TechTool Pro
    Multi-functional utility.

    Drive Genius Multi-functional utility.
  • Duncan MacLaren Level 1 Level 1 (0 points)
    I shall try tomorrow with the aid of my colleagues disk warrior.

    Also...there is a ticking noise coming from inside - is that bad news?

  • GFrancoeur Level 1 Level 1 (0 points)
    I'm having a similar issue - The computer just froze solid in the middle of use this evening, wouldn't force quit, and I had to use the power button. Upon turning it back on, it would not progress past the gray screen with the apple, and the fan went crazy.

    It wouldn't restart in safe mode, and then finally rebooted from the startup disk. It repaired itself in the first aid portion of disk utility, but now will not allow me to continue to try the Archive and Install feature explained in the troubleshooting portion of the site.

    No drives are showing up - Did my computer just erase itself? I'm so angry I don't know what to do. My machine is no longer under warranty, and I have never EVER had an issue with any Apple products.

    It says it repaired itself, still won't boot up, and I am unable to archive and install. Is my mac just completely worthless now? Will I be forced to reformat? How do I do that if the machine doesn't recognize its own hard drive? Is this going to put me at sqaure one when I finally am able to start up again? Can any disk information be recovered in the current state? And most importantly, is this worth the hassle that I know is coming? I know I've never had an issue with Apple - but I've also never had an issue with my Windows PCs of this severity. Is it time to call it quits on a system that essentially deletes itself without warning?
  • GFrancoeur Level 1 Level 1 (0 points)
    Replying to myself - but anyhow... Forget it. It just started back up, and it's completely bare. It looks like it did day one out of the box. I don't know how or why this happened, but WOW this is frustrating. =/

    Oh well. It's turning on again, but sadly, it decided that I no longer needed any of my files or information. So I guess this merits a change in the question. So is there anything I can do to recover anything that was on my hard drive? ...Or did my mac seriously just destroy all of the music, documents, etc.?
  • sassnak Level 1 Level 1 (0 points)
    A ticking noise combined with the fact that your computer won't reliably start up means there is a high chance your hard drive is dead. The ticking is something physically wrong with the drive, so it is unlikely to be fixable - you could most likely get data off of it still if you had anything, but you won't be able to use it anymore. If it is still under warranty, Apple will replace it. If not, you'll have to do it yourself or bring it in to a tech shop. Since you don't have iSight, that means the hard drive is user-replaceable - it is very easy to do. See Apple's instructions here:

    http://manuals.info.apple.com/en/imacG517inchharddrive.pdf for a 17"

    or here:

    http://manuals.info.apple.com/en/imacg520inchHardDrive.pdf for a 20"
  • Duncan MacLaren Level 1 Level 1 (0 points)
    Thanks for your response Sassnak, and also for the instructions. Just what I was dreading, but thankfully it shouldn't too much of a drama to replace myself. I'll be looking at a Maxtor SATA 320G-16M for around Aus $110. I have no idea what the best/reliable hard drives are to buy except for the ones the discussion forums mention.
    Anyway, will let you know how it goes.
  • Baby Boomer (USofA) Level 9 Level 9 (56,960 points)

    See my 1/9/08 response in this thread.
  • Duncan MacLaren Level 1 Level 1 (0 points)
    Well, I managed to replace my iMac with a seagate 250G HD. Have re-installed and everything is fine. The ticking was certainly a sign of the HD dieing so had to replace that. My experience of replacing the HD was very simple especially with the instructions being very easy to read. It was all straight forward except for the piece of metal wrapped around the HD was screwed on with these wierd jewish star shaped screws that were difficult to remove - apart from that, is was easy.

    Cheers everyone
  • tashazn Level 1 Level 1 (0 points)
    I just had the same problem. My iMac was otherwise fine until yesterday when I installed the recommended updates. I clicked the "restart now" button when the updates had finished installing, but the computer will not restart. I get the grey screen with the apple and progress indicator, but no progress is ever made. The fan runs on high speed. I let this run for about three hours, but nothing else ever happened, so I tried these things:
    1. Shut down the computer by holding the power button and tried to restart about ten times. -No change.
    2. Unplugged the power cable for more than ten seconds, then plugged it in while holding the power button to reset SMU. - No change.
    3. Reset PRAM by holding CMD + OPT + P + R until I heard the start chime twice. - No change.
    4. Restarted from the TechToolDeluxe CD. - Passed all tests except skipped surface skan and failed volume structure.
    5. Trying now to repair the volume structure...will update this when it finishes.

    Incidentally, my warranty just ended. When I called Apple, they said I could buy a 30-day warranty for $49. That's absolutely crazy. I am not kidding, my computer was perfectly fine until I installed the update yesterday. I find it a bit too coincidental that my HD kicked the bucket immediately after.
  • mailjamie Level 1 Level 1 (0 points)
    Need help, during software update update failed on reboot, now frozen. Grey screen freezes soon after power on, message "panic(cpu 0 caller 0x003999ca3):unable to find driver for this platform:"ACPI" debugger called (panic)then lots of code ended Kernel version:darwin kernel version 8.4.1 ROOT :XNU-792.7.90.obj-1/RELEASE-1386"

    Cannot access single user mode, have run disk utility check on HD -ok but still cannot get past the frozen screen on restart.

    Worried about full restore from systems disk as wedding photos on HD and I have no back up -

    Any suggestions greatly appreciated....
  • MGW Level 7 Level 7 (27,020 points)
    You should really start you own thread - if you have access to Disk Warrior or TechToolPro, boot from one of them and repair your directory, otherwise you should perform an Archive and Install, which will not delete your wedding pictures (please back them up on a DVD and get an external firewire drive and clone/backup your data regularly).

    Remember to check "preserve user settings and preferences" when you install.

    Photo Sharing and Video Hosting at Photobucket
  • tasharanee Level 1 Level 1 (0 points)

    Somehow, I can't log in with my previous user name, tashazn. Anyway, I repaired my disk volume four times with no results. I finally used the iMac install CD to reinstall OS X, archiving my previous info. My password no longer worked, and I could neither log in as myself (administrator) or as a guest (no password required previously). In the end, I just installed a fresh copy, erasing all my data. I'd probably backed up a month prior, so I lost some stuff, but not everything. My iMac is working normally again.

    I installed all the updates again, and there was no problem whatsoever.