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code 3 F O

HP Recommended
HP All in one 24 -R059a
Microsoft Windows 10 (64-bit)

Connected an external hard drive to the machine


HP Support Agent
HP Support Agent
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Hi @Jo312,


I'd like to help with the 3F0 error.


Try the steps below-


Step1: Remove and reinsert the hard drive

Step 2: Perform a hard reset

Step 3: Restore BIOS default settings

Step 4 Test the hard drive using HP PC Hardware Diagnostics


For instructions refer to -Boot Device Not Found Error or Hard Drive Not Detected


Hope this helps! Keep me posted. 


And, Welcome to the HP Support Community. 


Please click “Accept as Solution” if you feel my post solved your issue, it will help others find the solution.

Click the “Kudos, Thumbs Up" on the bottom right to say “Thanks” for helping

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