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Reset NVRAM. Release the keys after you hear the startup sound again. Start up from OS X Recovery over the Internet. Start up from a NetBoot server using the default boot image. Start up from a compatible NetBoot server. Start up to either Apple Hardware Test or Apple Diagnostics over the Internet. Start up to either Apple Hardware Test or Apple Diagnostics, depending on which Mac you're using. Start up from a bootable CD, DVD, or USB thumb drive (such as OS X install media). The links below point to other support documents on Apple's website. I'm betting many of you don't know them all, either, so here they are. I was personally familiar with these and several others, but it turns out there are 15 total combinations, thanks to a KnowledgeBase article Apple posted. Command-S is for "single-user mode," which essentially means booting to the command line.

Shift key, for instance, starts your Mac in Safe mode, and C (or c) starts up from a bootable CD, DVD, or thumb drive. Good luck! PS – check out for everything you need, including replacing/upgrading the RAM.Your Mac and OS X have a variety of startup keys and key combinations you can use to affect how the device starts up. Hybrid is nice as well, but either ways, completely depends on you. Never fused them – keep OS and all my Apps on the SSD, used the HDD for iTunes/Photos and iMovie data – so separate disks, with zero issues.

I moved my OEM 500GB HDD to the optibay, popped the dvd drive into an OWC external bay, which gets used once in a blue moon, and put a 500GB Crucial SSD into the HDD bay. Of late, I have had a few crashes, with the Report indicating it could be a memory issue, which means one of them might be on the way out, but I've ran it for 2.5 years now without any issues. Running 2x8GB Crucials with zero problems. You might need to do a bit of fiddling, since I vaguely recall some had issues with screws not being included or something, but I may be wrong. By all accounts, the one above works as well, so why spend the extra $$ when you can get away for cheaper. I went for one from OWC – which is better quality, but then you pay significantly more. Not sure about the Buyer – but have seen that Caddy before – as indicated in the other thread, quite a few MyBB users installed that one.