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Q: iMac mouse, keyboard and system freezes on fresh install

Trying to fix a friends 2008 2.4Ghz 20" iMac.  Originally had 1GB of RAM, which I've now upgraded to 4GB and worked fine using Snow Leopard. I've had a problem upgrading from Snow Leopard, so I decided to do a fresh install.  I backed up the data using Time Machine and that's sitting on a separate drive nice and safe.

 

I've created a bootable 8GB USB stick with Mountain Lion and Yosemite using the Disk Utility method and the DiskMaker method.   Using the Option + R to boot from the USB (but using Disk Utility first to do a Erase and Format (MAC Extended Journaled) on the Macintosh HD I then started the instal.  It starts fine and then around 13-14 minutes, the iMac totally freezes and I have no response from keyboard or mouse and just hangs.  I read that you need to be patient and wait, so I did

and 10 hours later I'm still here. 

 

I've tried OSX Recovery and OS X Recovery over the internet.    Everything I do with all the help our there, the machine just 'hangs' and becomes totally unresponsive.  I'm not convinced it's a hardware issue as the machine was working perfectly well in Snow Leopard just a couple of days ago. 

 

Does anybody have any thoughts on this, with any solution?  Anything would be really appreciated.  Otherwise it's a trip to the Genius Bar.

 

Cheers

iMac, Mac OS X (10.6.8)

Posted on Jun 20, 2015 8:05 AM

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