Are you getting the "Yellow Folder with a Question Mark? Chances are if you've already tested your HDD and it's fine it's mostly the Data Sync Cable you will need! PLEASE MAKE SURE TO CALL 613-294-5374 AND ARRANGE A TIME FOR PICKUP IF YOU RESIDE IN OTTAWA! BRAND NEW & 100% TESTED (SHIPPING AVAILABLE ACROSS CANADA @ $16.95 EXTRA IF REQUIRED VIA CANADA POST EXPRESS POST) THIS MEANS YOU WILL GET YOUR PARCEL WITHIN 1 BUSINESS AND 2 DAYS IN RURAL AREAS. 1) Part Number Compatible with MacBook Pro Year 2009 & 2010: Part Number (821-0814-A) 3 In Stock (Updated Feb 17, 2018) 2) Part Number Compatible with MacBook Pro Year 2011: Part Number (821-1226-A) 11 X In Stock (Updated Feb 17, 2018) Part Number Compatible with MacBook Pro Year 2012 & 2013: 821-1480-A 3 X In Stock (Updated Feb 17, 2018)