code 3 F O

[Jo312]

Connected an external hard drive to the machine

[Jay_G24]

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