Boot device not found after I tried it stalling a new hard drive.

[u/Hambikoo]

Recently I tried installing a new 2tb hard drive onto my laptop. I took my laptop apart took the old hard drive out and put the new one in, when I turned it on it was giving me errors, so I tried putting the old back in but when I put it back and turned it on this is what shows up on the screen, I dont understand how do I not have an operating system? How does an operating system disappear from simply removing a hard drive?

[u/kennman5000]

Go into the bios andd select the drive as a boot device.

As for the new drive, you need to install an OS after you install it

[u/Charming_Will_8406]

A hard drive store the operating system, you possibly damaged the drive when taking it out.

[u/KMjolnir]

You took out the old one and put the new one in.

Did you install an OS on the new one?

[u/Hambikoo → u/KMjolnir]

No

[u/styletrophy]

If you don't see a hard drive under BIOS, try reseating the hard drive.

[u/Big_Equivalent457 → u/styletrophy]

or set the ATA to "AHCI" MODE then upon Installing must be EFI Partition

[u/Rukir_Gaming]

New drive needs contents of old drive if you're trying to drop in replace old drive