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papalapa's picture
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Joined: 2018 Aug 24
Mac OS X Snow Leopard install on an iMac

Hello,

I purchased an used iMac 4,2 (Intel Core Duo 17” 1,83GHz) and I’m trying to install a fresh MacOS unsuccesfully. It seems that this model (A1195) was sold during only three months and only to schools. It have had a short life.....

I tried to install two different MacOs versions (Leopard and Snow Leopard) from DVD and from USB pendrive but in all of them when I choose the removable media from the boot manager the apple and the wheel turning are shown in the screen and after 1 minute the forbidden symbol appears and the iMac remains in this state. The external DVD is connected through an USB because the vendor cheated me and the iMac has not internal optical drive although this model has a built-in one from factory. As do not loaded any disc I opened the iMac and I found the EMI shiled released and the optical drive missing.

I also tried to launch the installer from the already installed MacOS (10.4 Tiger) but is asks for the admin password that obviously I do not have. The Snow Leopard version that I’m trying to install is the right one (for Intel) and I want to format and completely erase the whole disk and do a fresh installation.

¿What else can I try?

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blackholemac's picture
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Joined: 2010 Nov 17

One a working Mac, mount a copy of 10.6.3. Use Disk Utility and Restore functions to restore the contents of the CD to a working USB stick. I have a USB stick of the Snow Leopard installer and it works great...you simply need to boot to it afterward.

scott Praed's picture
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Joined: 2010 Oct 30

Here is something I think will help you. You said who don't have admin password.

click on System Preferences and Then click on Accounts and your name should be on admin account then click on change password.

24bit's picture
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Joined: 2010 Nov 19

If the iMac´s HHD is in a "unknown" condition a older version of GParted should wipe it clean.
After that, DiskUtility should be able to initialise it after booting from a Snow Leo retail DVD.
I had similar issues with second hand HDDs, occasionally.

The Internet Archive is hosting a SL retail DVD btw: https://archive.org/details/SnowLeopardInstall

Duality's picture
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Joined: 2014 Mar 1

There's a really dumb trick from the Tiger/Leopard/SL-not-Server days to make the Mac think it's just been freshly installed, which will give you the ability to create a new account with admin permissions.

http://www.hackmac.org/tutorials/how-to-create-a-new-administrator-account/

Mostly easy. It might have have you running into problems with the last Tiger release judging by the comments, though, so it might be best to try one of the above suggestions first.

muttztfz's picture
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Joined: 2010 Dec 2

You can try a different USB optical drive. I had this in the past that some drives work better than others.

You could also try to boot from USB Pen drive, though it is not that trivial to get the installer from the DVD over to a USB Pen drive, especially without a Mac. Do you have another Mac?

You could try Target Disk Mode and install Mac OS X from the other Mac, if you have access to another Mac that is...

WhosIt.There's picture
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Joined: 2014 Aug 23

You can try a different USB optical drive. I had this in the past that some drives work better than others.

Some older drives (internal and external) have problems reading burnable discs - some will work fine with CD-R, but fail with CD-RW for example. Others will have problems with both.

There's also the issue that not all USB ports are the same. Possibly try a different USB port, or get a double cable to supply more power to a USB-powered external drive.

muttztfz's picture
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Joined: 2010 Dec 2

The safest bet is to use a full powered external case that doesn't use the USB port for power. I have one of those old USB 2.0 full 5.25 inch size cases, which could be used with almost anything that fits - HDDs, Zip drives, CD-drives, DVD-drives, whatever. I think it was still ATA (IDE). Anyway, since it doesn't depend on the power it gets from USB, this one never let me down. Also the DVD-RW I use in it was the best as far as compatibility to CD-Rs and DVD-Rs goes. E.g. the internal drive of my Clamshell iBook G3 wasn't able to read some CD-Rs whereas the external drive didn't have those problems. I could boot even Mac OS 9.1 with it, and all Mac OS X (PPC) versions. That is, with the USB Open Firmware trick of directly calling the specific partition on the disc.

papalapa's picture
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Joined: 2018 Aug 24

Many thaks to all of you for the suggestions, after some unsuccefull tests finally I ordered a Snow Leopard DVD to Apple and I'll pick it tomorrow at the Aple Store. We will see...

papalapa's picture
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Joined: 2018 Aug 24

Well, finally I succesfully installed Snow Leopard on my iMac. It was easy with the Original Retail DVD from the Apple Store. Just to boot from DVD, partition and erase the hard disk and install.

papalapa's picture
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Joined: 2018 Aug 24

Just another question: Is it possible to install an optical drive without the temperature sensor? I found a drive on eBay but is only the drive with the mounting bracket. Will it work?

24bit's picture
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Joined: 2010 Nov 19

From the OS, yes. Tons of SL Hackintosh did work with third party optical drives.
The old ATA kexts did work with almost any device - unlike SCSI, were support was marginal.
My sATA optical is still working with Sierra, it has no temp sensor either, btw.
I never tried installing/replacing a slot loading DVD drive, good luck!

This should be your iMac: https://everymac.com/systems/apple/imac/specs/imac_cd_1.83_17_ig.html
I have a T60 with similar specs running 10.6.7 until today (occasionally).

Here is some stuff about replacing HDD, maybe it helps.
https://www.ifixit.com/Guide/iMac+Intel+17-Inch+Hard+Drive+Replacement/891

muttztfz's picture
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Joined: 2010 Dec 2

I have a T60 with similar specs running 10.6.7 until today (occasionally).

May I ask why you don't upgrade it to 10.6.8?

24bit's picture
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Joined: 2010 Nov 19

Sure, yes.
That T60 has a stock Atheros WLAN mPCIE (not the common Intel one) working as Airport until 10.6.7.
Something breaks the Airport functionality in 10.6.8.
I tried with kext roll-backs back in the days, but no dice. So I decided to leave it as it is.
Never touch a running system, wasn't it? Wink

sfp1954's picture
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Joined: 2013 Dec 29

I would replace it with an Apple Airport card dated 2008.

papalapa's picture
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Joined: 2018 Aug 24

Thank you for the information. Yes, you're right mine is A1195 model.

I found on ifixit.com how to replace the optical drive on this model but I was not sure if temperarute sensor was mandatory or not. I'll try to locate a drive and start to work Wink

sfp1954's picture
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Joined: 2013 Dec 29

The temperature just can be peeled off of the bottom and attached to the new drive I believe.
If you don't have a temperature sensor this will register as an overheated (ie max temp) optical drive and could halt operations.