Mac OS X El Capitan 10.11.6 installed on the internal drive.Upon checking after Monomeeth's answer I can add that the original Snow Leopard disc I am trying to boot from is indeed a retail version containing 10.6.3. And Yes, it’s trying to tell you something!Ī looping three beeps in between three seconds during startup is your iMac’s way of telling you that the operating system you’re trying to boot into is incompatible with your Mac hardware. In other words, the Snow Leopard disc you’re trying to boot from contains a version of Snow Leopard that is earlier than version 10.6.6 (the earliest your iMac can support). My guess is that you’re not using the grey disc that shipped with your iMac. It’s either one that belongs to another Mac or it’s a retail version that’s earlier than 10.6.6. Now install Snow Leopard onto the external drive (i.e.Boot the MBP from the Snow Leopard disc.Connect it to your Mid 2009 MBP with a FireWire cable (once connected it’ll be seen by the MBP as an external hard drive).Boot your iMac into Target Disk Mode by pressing and holding the T key as you startup.The only ways to get around this is to use another disc or do the following: MACBOOK PRO 3 BEEPS REPAIR MAC
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