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OS X - Operating System General OS operation information and support

Imac not recognising bootable USB


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Bagslash

 
Member Since: Dec 11, 2011
Posts: 2
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Hi, sorry if this question is in the wrong place, I'm having terrific trouble trying to install Snow Leopard.
I have a blank 16gb USB, I went to Disk Utility, erased, created a GUID partition and then moved onto Restore, I selected the new USB as the Destination and the (mounted) Mac OS X Install.dmg as the Source. I clicked 'restore' and it began 'copying blocks'. This appeared to be successful after about 25 mins.

My problem occurs at this point, if I go to Startup Disk the new USB Mac OS X install shows up, if i click it and press restart it simply boots back up in Tiger. If I shut down and restart holding Alt no other option appears than the original Macintosh HD (again booting it up in Tiger). It's as if it cannot see there is a USB there at all, but as I say it does recognise it in Startup Disk.

Is there any reason that the iMac wouldn't recognise the USB? The iMac info is:
Hardware Overview:

Model Name: iMac
Model Identifier: iMac5,1
Processor Name: Intel Core 2 Duo
Processor Speed: 2.16 GHz
Number Of Processors: 1
Total Number Of Cores: 2
L2 Cache (per processor): 4 MB
Memory: 1 GB
Bus Speed: 667 MHz
Boot ROM Version: IM51.0090.B09
SMC Version: 1.9f4

(not sure if this helps?). I did speak to an Apple tech support man who said there should be no problems with booting from this method (before I attempted it!).

I have been trying now for 3 days and get the same result each time!

Can anybody help?

Thank you in advance.
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chscag

 
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Member Since: Jan 23, 2008
Location: Fort Worth, Texas
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Mac Specs: 27" iMac i5, 3.2 GHz, iPad 3, iPhone 5c, 3 iPods, Yosemite

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Not sure I understand why you're trying to install Snow Leopard in this manner?

And, where did the Snow Leopard image come from? A Snow Leopard install DVD is only $29.99 purchased direct from Apple. What's the purpose of booting from a USB flash drive unless your optical drive is not working?
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Bagslash

 
Member Since: Dec 11, 2011
Posts: 2
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Thanks for replying so quickly, chscag. The story is slightly convoluted, I bought the mac last week from a Chinese chap who is moving back to China, the mac is his girlfriends (who has already moved back), the Snow Leopard .dmg file had been put onto the mac after a clean install of Tiger in case the new owner wanted to upgrade and she took the boxed copy of Snow Leopard with her. I am brand new to mac's, is this the wrong thing to do?
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harryb2448

 
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Member Since: Nov 28, 2007
Location: Nambucca Heads Australia
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Mac Specs: iMac i5 2.7GHz, 16GB memory, OS 10.10.1

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You need your own system install disc to install an operating system. And what are the details of your iMac?

Hang on to those original install discs like grim death! Using OS X.7 or later make a bootable USB thumb drive before running Installer!
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