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. Unless you are a Professional the time spent discovering this is nauseating.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 In the past I have found, after many days of trail and error, that the RAM may have had ESD damage and cause erratic behavior. If not live with one stick, the highest your machine will take. If slot is bad, use the screw solution or sometimes it will take a lessor stick (if you have one). If the slot, try loosening the screws that hold the slot in place - crazy, I know but it can work. Now you have known good or bad sticks or known bad slot. Take one stick only, try it in both slots to check out both the RAM and the slot. Remove the RAM, use canned air and blow the slot out. Now you need to test if a slot has gone bad or partially bad.
You are correct, and did the right thing. OK the three Beeps are a RAM issue, as you already know.
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