Boot device not found 3f0

[Paolo1985]

turn on the laptop and... "Boot Device Not Found Please install an operating system on your hard disk. Hard Disk (3F0) F2 System Diagnostics " What i can do?

[TheOldMan]

First thing is to run the Diagnostics as the warning indicates. F2  Then report back with the results.

It that reports the hard drive is still missing, then the hard drive has failed and needs to be replaced.

[Paolo1985]

Yes, I tried it's all ok

[TheOldMan]

If the diagnostics say the drive passed, then also check to see if there is any media in a DVD/CD drive or a media card in a card reader.  Also disconnect any other devices.  If all that checks out, then you need to try a repair of the boot manager.  Or possibly reinstall Windows.  For either of those, you will need the Windows install media.

If you need the install media for Windows 10, you can make it from this Microsoft download

https://www.microsoft.com/en-us/software-download/windows10

With a working PC, scroll down to the "Using the tool to create installation media"
and then follow the directions. You can make either the DVD or USB.

Boot to this new media and pick "Repair this PC" and let it try the repair.  Here is a guide.  Scroll down until there is a Windows install screen shown then follow the directions outlined in the article.

https://www.howtogeek.com/howto/32523/how-to-manually-repair-windows-7-boot-loader-problems/

If that all fails, then reinstall Windows 10.
When the install asks for the product key, click the I don't have a product key option to continue,
then the install will continue It will be activated once it connects to the internet, as it uses a digital key.

[muammer]

Hello there, This problem also occurs when a change is made in Bios mode. Make sure that UEFI mode is turned on in the bios settings. Or restore the Bios factory settings.

[Paolo1985]

Hi solved by re-installing windows thank you all!