2012 A1278 820-3115 Common Memory Slot Fault. Lines on the screen. Freezing Up. Sorted! - YouTube
SOLVED: Stuck ram that wont come out. Pressed against metal behind ram slot - MacBook Pro 15" Unibody Mid 2012 - iFixit
SOLVED: Faulty RAM Slot not allowing machine to boot - MacBook Pro 15" Unibody Late 2011 - iFixit
How to upgrade the RAM on your 13-inch MacBook Pro
Apple MacBook Pro A1278 with 1 RAM Slot NOT WORKING - Trying to FIX - YouTube
Now Here's a MacBook Pro That's Easy to Repair | WIRED
MacBook Pro: How to remove or install memory - Apple Support
SOLVED: Need RAM Holder Replacement - MacBook Pro 15" Unibody Early 2011 - iFixit
SOLVED: Issues with bottom RAM-slot MBP 2012 - MacBook Pro 13" Unibody Mid 2012 - iFixit
17-inch MacBook Pro Mid 2010 Memory Installation Video - YouTube
SOLVED: Issues with bottom RAM-slot MBP 2012 - MacBook Pro 13" Unibody Mid 2012 - iFixit
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RAM retainer clip broke | MacRumors Forums
How to upgrade the RAM on your 13-inch MacBook Pro
Memory/ RAM Upgrades For Apple MacBook Pro 2011 from OWC
2012 MACBOOK PRO FAULTY RAM PORT FIX... yes it really works - YouTube
SOLVED: Issues with bottom RAM-slot MBP 2012 - MacBook Pro 13" Unibody Mid 2012 - iFixit
NEED HELP - My ram housing/clips broke an… - Apple Community
SOLVED: Issues with bottom RAM-slot MBP 2012 - MacBook Pro 13" Unibody Mid 2012 - iFixit
SOLVED: Issues with bottom RAM-slot MBP 2012 - MacBook Pro 13" Unibody Mid 2012 - iFixit
RAM retainer clip broke | MacRumors Forums
MacBook Pro A1286 disassemble to detect memory slot not pluged correct and water damage - YouTube
How to upgrade RAM (up to 8GB) on MacBook 13 inch (White) Late 2009 & Mid 2010? | TechLunar
MacBook won't turn on? 12 ways to fix it
Upgrading RAM in Your MacBook Pro 13" or 15" : 19 Steps (with Pictures) - Instructables