Slow startup after installing the SSD because gray screen

I just installed a Samsung Evo 500 GB SSD in my Macbook Pro 2010. I went to start and it starts very slowly due to a gray screen just sat there for about 30 seconds and then it shows the apple logo and it takes another 15 seconds to load. The gray screen did not appear before installing the SSD but the Apple logo did take longer to load with the HARD drive. I used SuperDuper to clone my my SSD HARD drive and installed the SSD and it starts normally. The only issue was the gray screen. I've heard that I need to go into system preferences and select Startup disk, then my boot drive, but there is no choice. Help, please.

Have you seen this article?

How to choose a boot on your Mac - Apple Support drive

Tags: Notebooks

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