Skip navigation

Replacing hard drive in iMac 20"....only get blue screen with original CD inserted?

765 Views 11 Replies Latest reply: May 21, 2012 2:51 PM by noondaywitch RSS
dan.collison Calculating status...
Currently Being Moderated
May 4, 2012 1:43 PM

I'm replacing this hard drive but all I get is a blue screen when I insert the original CD....has anyone seen this?

iMac, Mac OS X (10.4.8)
  • RRFS Level 5 Level 5 (4,425 points)

    Did you preformat the Harddrive to os journaled and install the operating system or just slap i a harddrive? Are you holding the "c" key during startup? That will start your iMac from the CD.

  • iCare Level 4 Level 4 (1,705 points)

    Which model iMac do you have? What kind of hard drive did you install?


    Do you have the original Install DVD that came with the iMac? Is this the 'CD' that you said you put into the iMac?


    Try this.


    Insert the Install DVD into the optical drive, then pull down the Apple menu and select restart. Immediately hold down the option key and keep it held down until a menu appears listing any bootable volumes. You should see an icon representing the Install DVD that is in your optical drive. Select the Install DVD icon and then press return to attempt to boot from the Install DVD.


    If the Install DVD successfully boots you should be able to pull down the Utilities menu at the top of the display after  you select which language you are using. With the Utilities menu pulled down select 'Disk Utility'. You can then select the hard drive from the Disk Utility menu and click on the erase  button. Depending on which version of the OS is installed on the Install DVD there may be slight differences in the steps, however you should be able to figure it out. Once you erase the hard drive and format it as a Mac OS Extended (Journaled) volume you can quit Disk Utility and return to the Mac OS X Install DVD OS installation menu to complete the installation process.

  • ds store Level 7 Level 7 (30,305 points)
  • noondaywitch Level 6 Level 6 (8,130 points)

    Boot from your grey installer DVD disc 1 (hold down the C key on startup or hold down Alt/option on start and choose the installer disc).


    OK the language page (if present). From the installer screen, go to the menu bar and choose Disk Utility; depending on the OS version it may be in the Utilities menu or Tools menu.


    In DU, select your internal drive in the sidebar (the top item with the makers name and serial no.).


    Click the partition tab. Select the partiton from the drop-down above the graphic; 1 partiton is all you need. Go to the options button and ensure that the partition scheme is GUID (for Intel Macs) or APM (for G5 and earlier) and

    the file system to Mac OS Extended (Journalled). Name the partiton (usually Macintosh HD), click Apply.


    When that's completed, close DU and continue with the installation.

  • noondaywitch Level 6 Level 6 (8,130 points)

    Right, I think we need some more information here.

    What model of iMac is it? If you're not sure exactly, what year?

    What's the OS version and build number on the disc?

    (Note - discs from another computer won't usually work, but you may get away with it they're the same build number)


    Apart from the usual SMC reset and PRAM/NVRAM reset (which I don't have much hope for in this case but it never hurts);

    <Afterthought; if the Mac is more than 4 or 5 years old, it may be worth having a look at the PRAM Battery>


    Try the Restore DVD (disc 2), booting with the D key held down. If it loads Apple Hardware Test, run the full test in extended mode two or three times and see if any hardware problems are reported.


    If that won't boot either, I'd begin to suspect the optical drive itself.


    However, after checking the HD installation (again?) particularly looking for any problems with the leads, try pulling one of the RAM sticks and try again, then the other if still no joy. (when seating the RAM, make sure you feel the soft click - Apple seem to use tighter holders than yer average PC).


    Another possibility, in case it is the optical drive, is to remove the HDD again and put it in a suitable enclosure, connect to another Mac and format it with Disk Utility from there, then try installing from the disc 1 inserted in the other Mac (don't try to boot from it).


    Return it to the problem Mac and see if it will boot normally.


    All I can think of for now. All the leads I followed up for this case were unresolved, so we're hoofing it from here.

  • noondaywitch Level 6 Level 6 (8,130 points)

    The only grey Tiger disc that will work is the one with the build no. 8N1430 on it (for 10.4.8 - they shipped with 10.4.7 in late 2006, 10.4.8 would indicate a 2007 model).


    If it boots to Apple Hardware Test, it's unlikely (though not impossible) to be the logic board, or indeed the optical drive.

    Must be something about the installer.


    Only other suggestion I can make is to try it with a Snow Leopard retail install DVD (the model should boot Snow Leopard without problem). If you have one, that is.

    You could at least complete the partition and format from there, even if the owner doesn't want SL on the Mac.



    Whoa, didn't see the sns code before posting.


    That's a sensor on the logic board - probably for fans, but I couldn't say which one.

    That leads to the question as to whether the HD is in fact compatible, as some later model HDs have different sensor wiring.


    Might be worth a check with OWC.


    Message was edited by: noondaywitch

  • noondaywitch Level 6 Level 6 (8,130 points)

    Further update - confirmed as a HD sensor error.

    Could be the temp sensor on the hard drive, or the logic board might be at fault.


More Like This

  • Retrieving data ...

Related Articles

Bookmarked By (0)


  • This solved my question - 10 points
  • This helped me - 5 points
This site contains user submitted content, comments and opinions and is for informational purposes only. Apple disclaims any and all liability for the acts, omissions and conduct of any third parties in connection with or related to your use of the site. All postings and use of the content on this site are subject to the Apple Support Communities Terms of Use.