I followed and completed the Hard Drive Replacement guide and ran into a problem when I turned the computer on - no sound. Despite no sound, the computer starts up fast and the applications run much faster than before.
I checked the Sound in System Preferences and the Output was set correctly to Internal Speakers. Also, mute is NOT checked.
I did the PRAM and SMC reset and used Apple Diagnostics to see if there were any issues with any of the components inside the computer - there were none.
The OS is updated to Catalina.
And lastly, I replaced the original hard drive with a Western Digital 500GB WD Blue 3D NAND Internal PC SSD which Amazon says is Mac compatible.
I took the computer apart and went through the steps a second time and still got the same results of no sound. Is it possible that I missed connecting a cable or perhaps damaged a component?