If your Mac doesn't start up
If your Mac starts up to a flashing question mark, but then doesn't continue starting up, try these steps.
Turn off your Mac by pressing and holding the power button for a few seconds.
Press the power button once to turn your Mac back on. Immediately press and hold the Command and R keys on your keyboard to start your Mac from macOS Recovery. Keep these two keys held down until you see an Apple logo or globe.
If prompted, select a Wi-Fi network to connect to the Internet as part of startup.
After the macOS Utilities window appears, choose Startup Disk from the Apple menu.
Select your startup disk, then click Restart.
If you don't see your startup disk in the Startup Disk window, close the window and try the next sections of this article.
https://support.apple.com/en-us/HT204323
This is the exact model I have, and the Monitor is clear!
It dos he same exact thing as the one in this ideo, with a blinking question mark. I already had he hardrive replaced sev. years ago with added ram. It worked perfecty up until the other day. The Hard drive can't be dead.
I have the original software start up disc for it. But I can't get into the settings cause the disc says log, so I cant select the hard drive icon, can do anything. Have any suggestions? Thanks in advance.