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I am getting a white screen flashing folder with a question mark. I have changed the hard drive and the hard drive cable, Anyone with any ideas

Here’s a break down of what the startup symbols mean About the screens your Mac displays as it starts up As we can see the the flashing question mark is the system can’t find your system software. Which makes sense as you replaced the hard drive and its currently blank! So we need to first format the drive as well as install a fresh copy of the OS. You’ll need to leverage internet recovery. Restart your system and press the Option - Command and R keys Reference: Mac startup key combinations Then Follow these actions in order: How to erase a disk for MacHow to reinstall macOS from macOS Recovery