You can release the keys after the second startup sound or once the Apple logo appears and disappears for the second time. When it's 4GB or 6GB, it works fine, although a bit slow since I installed El Capitan, which is why I'm upgrading the memory. Immediately press and hold these four keys as it is booting up: Option + Command () + P + R. This machine supposed to be upgradable to 8GB. Any 6GB combination, regardless of which RAM uses which slot, also works fine. When Apple discontinued their 17 MacBook Pro line, many Apple fans held. I have already tried almost all different combinations between these 6 RAMs (2 old 2GB, and 4 new 4GB). We review, breakdown, and upgrade the fastest last line MacBook Pro 17 model. They are 204-pin DDR3 SO-DIMM 1600 (PC3L 12800) RAMs, which seems to be the correct kind. I have already tried 2 different sets of 4GB RAMs, one couple was second hand, the other pair brand new Crucial. because when I try one of the new (4GB) RAMs with one of the old (2GB) RAMs, it works fine. I am pretty sure this is not about RAMs not being inserted properly, or dusty slots etc. Mojave has the generic MP51.fd firmware image inside the full installer, it's enough for boot your Mac Pro again but not for iCloud/iMessage. The Macbook I have is a mid-2009 and has OSX El Capitan. Btw, yes, you can use a MXIC MX25元206E as a modern replacement for the two older models SST25VF032B and MXIC MX25元205D used on early-2009 and mid-2010 respectively, Apple did it for mid-2012 Mac Pros. I saw other people had the similar issue, however mine seems to be a bit different. Next click on ‘ X ’ to shut down the application. Type in ‘ Mail ’ in the search box and then highlight the app. Click on the Activity Monitor App to launch the utility. I am trying to upgrade my Macbook Pro memory from 4GB to 8GB, however when I start the laptop it beeps 3 times, without loading the OS, and just keeps doing that. Click on the Spotlight icon at the top right corner of your MacBook and type in Activity Monitor (image).
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