Upgrading OS X Leopard

[nampramos]

I'm having some trouble upgrading the newly formatted Mac from its original OS X Leopard.

I do not have the SL DVD anymore since I removed the optical drive but I have the dmg I previously generated from it, which I now mounted in an external hard drive and am trying to boot from it.

What happens is that I get an error saying OS X was not able to install on this computer. It worked fine installing from the external hard drive with Leopard.


Anyone knows how I could possibly fix this?

Thanks a lot!

 

[borgqueens]

If you want to upgrade to mountain lion you can do it from App Store directly

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but I don´t know if that is enabled in Leopard OS, hoping you can

 

[MyMac1976]

try to restore from the .dmg to a small partition in you main drive then boot from that.

If you can't de that then you really need access to another computer to either burn the DMG or to create and bootable USB of pick a a linux so you can have access to and create a bootable USG of the DMG or hook up an external DVD drive.


Methinks removing the optical drive was a bad call.

 

[SadChief]

I'm having some trouble upgrading the newly formatted Mac from its original OS X Leopard.

I do not have the SL DVD anymore since I removed the optical drive but I have the dmg I previously generated from it, which I now mounted in an external hard drive and am trying to boot from it.

What happens is that I get an error saying OS X was not able to install on this computer. It worked fine installing from the external hard drive with Leopard.


Anyone knows how I could possibly fix this?

Thanks a lot!

This happens when the OS already installed is a subsequent version of the version one tries to install (e.g., you have already 10.5.8 installed and you are trying to install the 10.5.5 version over it).
In such a case, erasing the HD/SSD drive is mandatory.

Edit: Should you want a system re-install, applying the 10.5.8 Combo update is highly recommended.