Macbook pro 3 beeps snow leopard4/15/2023 My question to you is why did you choose to use Target Disk Mode to install the OS? Are the Optical Drives inoperable? Thus it is not a question of incompatible hardware.Ĭurrently I am in the process partitioning the 2010 MBP in order to install the Snow Leopard retail disk OS just to make certain that it is functional. The 2006 MBP has Snow Leopard installed in another partition and Leopard in the third partition. A PRAM reset was needed to unfreeze it and retrieve the disk. My 2010 MBP made the restart chime but was stuck on the Apple logo screen with the SL install disk inside. The result was that some of the OS files were installed but not all. I made that a Target Disk MBP and used my 2010 MBP as the source to install a retail Snow Leopard OS in an empty partition. I have spent the bulk of the morning recreating what you have done with dissimilar but unsuccessful results. ![]() When I first got the 15 Macbook Pro, it would boot to the Username and Password screen so it looked like it had been used on a regular basis before it was sold. No joy! Again the gray apple, spinning wheel and the repating set of 3 beeps. Then I unmounted the 15" and put the Mountain Lion disk in and tried to boot the 15" from the CD. Again I used Disk Utility to Erase the 15" hard drive. Undaunted, I again started it in Target mode and hooked it back up to the 17" Macbook Pro. But upon unmounting and restarting, the 15" Macbook Pro returns to the gray apple and spinning wheel and 3 beeps. ![]() In the Target mode, it showed the installation was successful. Then I used a purchased copy of Snow Leopard to reformat the drive. So I booted it as a taget drive and hooked it up to my 2008 17" Macbook Pro and used Disk Utility to erase the hard drive. ![]() I tried to reboot from a purchased copy of Mountain Lion and I just get to the gray apple with the spinning wheel and a repeating 3 beeps. They had not removed their software from the Macbook and did not provide the username and password. I bought a 2010 Unibody 15" Macbook Pro from an office that was closing.
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