Solid State Drive For Mac Book Pro Late 2011
It might be a matter of how the screws are driven in, and not that they're slightly different sizes. When I reassembled my MacBook, a couple of the screws, including the one over the optical drive you mention, were hard to drive in and jutted up a little bit instead of sitting entirely flush. Swapping screws didn't help. The solution was to unscrew them and drive them in at a bit of an angle - perpendicular to the slightly curved surface of the back plate where the screw holes were, instead of fully vertical with respect to the ground the Macbook is sitting on. Doing it that way, the screws were easier to drive in and they all ended up flush in their holes.
Didn't matter which screws they were. (I swapped a few around just to check after reading this.). Actually the four screws on the bottom were not threaded all the way up. I didn't check to see if the thread gauge was the same on them, but it wasn't until I had about four screws out (I didn't take them out in the order that the bottom all came out first) that I noticed a difference. I then took out the rest of the bottom ones to see if they matched the two that were already out that weren't threaded to the top.
Also, this old iMac is a late 2009 model. I have read of various problems with OS X 10.9 and above. Firefox update for mac 10.8.5.
MacBook Pro 13-inch (Late 2011) Solid State Drive; Solid State Drive SSD 2.5-inch. For the Apple MacBook Pro 13-inch (Late 2011) What brand is it? 128 GB - $99 $189 You save: $90. 256 GB - $159 $269 You. There are lots of advantages to adding a Solid State Drive to your Apple system. Unlike regular hard drives, a SSD does not. I use Crucial in my early 2011 MBP. OWC (macsales.com) sells compatible units. Samsungs are actually posting several issues in these forums.
So I went under the assumption that those were all bottom screws and when I put it back together everything went fine with no resistance. So there are three types of screws: Four for the bottom, three long ones as indicated and three others that might be slightly smaller than the bottom ones. Hi, Although its more than a year since your contribution, I thought you might be amused to know that it is not just that the screws go in more easily when at an angle, Apple actually drilled and tapped the holes at a 15% angle. I too had tried to drive them in straight. An Apple 'genius' - I was in for something else - clarified the design for me. It was done so that the screws lay flush on the angled part of the lower case. Nice design, but since Apple encourages DIY memory and drive changes, they could have mentioned this little.
Worked like a charm! Took less than 20 minutes. 2015, and the fan cost me about $10. It was the same brand/model. SUNON MG62090V1-Q020-S99.
SOME TRICKS - 1- no T6 screwdriver- was careful using needle nose players to loosen 2 screws protruding up, then use a small phillips to push real hard into the T6 slots, SLOWLY turn, also used a small flat head screwdriver (for eye glass repair) was able to grab thread on T6's, made a small mark with screw driver across the top so I could see when it started to turn. 2- no spudger -made one; cut a little strip 1/2' x 1 1/2' of plastic. Couldn't get it to slide under plug, there's an edge where plug fits. So lifted old fan out, pulled upward on the plug it popped right out with very little effort.