On the light blue login screen, the apple logo, a crossed out circle, and a ? appear and I can't login. how do I fix it?

The laptop turns on fine but the apple logo come up flashing the logo, a question mark, and a    crossed out circle. How do I fix this?

Startup your Mac while holding down the Option key. That should prompt the Startup Manager window where you can select the startup disk.
If that didn't help, try here  >  A flashing question mark appears when you start your Mac
The ? mark on boot can mean several things. One, your Mac can't find a system folder to boot from, hence booting while holding down the Option key, or the startup disk needs repairing.

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