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<blockquote data-quote="pigoo3" data-source="post: 1636212" data-attributes="member: 56379">The minimum OS for this computer is OS 10.6.3 (which just so happens to be the exact OS version mentioned on the Snow Leopard retail disk you have).<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile&nbsp; &nbsp; :)" loading="lazy" data-shortname=":)" />&nbsp; Given the fact that you are having problems booting from the Snow Leopard disk...maybe the disk is dirty/damaged (maybe unlikely since it is new).&nbsp; Or the iMac's optical drive is dirty/damaged.&nbsp; You could try blowing some &quot;canned air&quot; in the optical drive slot to see if that helps.&nbsp; If not.&nbsp; Then maybe the optical drive is busted.Since this computer (I think from what I'm reading) can boot into Ubuntu...does the optical drive work when running Ubuntu?Another thing you could try (especially if the 2010 iMac's optical drive is busted) is &quot;Target Disk Mode&quot; (if both computers have a Firewire port, and you have a Firewire cable):<a href="http://support.apple.com/en-us/HT1661" target="_blank">How to use and troubleshoot FireWire target disk mode - Apple Support</a>I'm not 100% sure if you can install the OS from one computer to another using Target Disk Mode.&nbsp; I think that you can.&nbsp; I seem to remember doing it about 5 years ago (hard to remember some times)!<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite2" alt=";)" title="Wink&nbsp; &nbsp; ;)" loading="lazy" data-shortname=";)" />You would connect the two computers via the firewire cable...boot the 27&quot; iMac with the Snow Leopard disk...and install Snow Leopard on the 21&quot; iMac (of course read the link for the exact details).<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile&nbsp; &nbsp; :)" loading="lazy" data-shortname=":)" />HTH,- Nick</blockquote>

[QUOTE="pigoo3, post: 1636212, member: 56379"] The minimum OS for this computer is OS 10.6.3 (which just so happens to be the exact OS version mentioned on the Snow Leopard retail disk you have).:) Given the fact that you are having problems booting from the Snow Leopard disk...maybe the disk is dirty/damaged (maybe unlikely since it is new). Or the iMac's optical drive is dirty/damaged. You could try blowing some "canned air" in the optical drive slot to see if that helps. If not. Then maybe the optical drive is busted. Since this computer (I think from what I'm reading) can boot into Ubuntu...does the optical drive work when running Ubuntu? Another thing you could try (especially if the 2010 iMac's optical drive is busted) is "Target Disk Mode" (if both computers have a Firewire port, and you have a Firewire cable): [url=http://support.apple.com/en-us/HT1661]How to use and troubleshoot FireWire target disk mode - Apple Support[/url] I'm not 100% sure if you can install the OS from one computer to another using Target Disk Mode. I think that you can. I seem to remember doing it about 5 years ago (hard to remember some times)!;) You would connect the two computers via the firewire cable...boot the 27" iMac with the Snow Leopard disk...and install Snow Leopard on the 21" iMac (of course read the link for the exact details).:) HTH, - Nick [/QUOTE]

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