@rcl1964 , when replacing a hard drive, you normally need to reload the operating system and other programs that came with it.
If you have a fast internet connection, you can use [http://www.idownloadblog.com/2016/02/25/how-to-start-up-your-mac-in-internet-recovery-mode/|Internet recovery.]
Otherwise, if you know someone with a working Mac, you can have them make a bootable [http://lifehacker.com/how-to-make-a-bootable-macos-sierra-usb-flash-drive-1786853248|USB installer for OS X].