Hi, I have an early-2011 MBP 15" and had the HD changed to SSD(Samsung V-NAND SSD 850 EVO) with Sierra installed. While booting, I noticed a colourful horizontal stripe appear across the screen. It disappears after awhile and boots ok. I'm able to log normally and everything seems ok. The local Apple service center did a video test and suggested the brand new SSD may be defected. Has anyone experienced this irritating horizontal stripe on boot up? I've attached a pic of the screen of the video test and the horizontal stripe. Hope someone out there has a similar experience.