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That screen indicates there is no valid system installed and it's booting off the recovery partition. The "flat" traffic light buttons indicate it had at least macOS 10.10 installed, which has recovery,
2010 models shipped with optical install/restore disks. I'm guessing those valuable tools were not included. Therefore, Apple's instructions for recovery are here:
Use macOS Recovery on an Intel-based Mac - Apple Support
You may need to use internet recovery.
First conect the computer to a network with internet access . I prefer using a cable instead of wireless installs.
From the above article, try starting recovery from the window shown by clicking the seconds option. If that does not proceed, use the boot key combos.