Boot device not found. Please install an operating system on your hard disk. 3F0

[Liam40]

It says Boot device not found whwn i power on my computer. " please install an operating system on your hard disk, 3F0"  . Ive tried the different booting methods but none of them seem to work. I have also tried the  Long hard drive check and long memory test however it all passed with no issues. There was some issues with the laptop before with critical proccess died and i got told to install windows 10 but i have not tried it yet since i was hesitant.It sometimes says " no bootable device - insert boot disk". Got any suggestions?

[banhien]

@Liam40 

Please use the following Official Guide to fix

                        HP PCs - Hard disk 3F0 boot device not found error

Regards.

[Liam40]

Do i have to install windows 10 on this device? If so do i need another pc in order to Download a windows 10 copy onto this device using a usb flash drive?  I only have a macbook with os on it. I also want to know how to do it step by step.Thanks!

[piano40s]

Don't know if this will help but it might, I took my pc to bits to clean it the fans and all, when put back together I got the same 3fo error, three days of looking at vids and trying all the suggested fixes with no luck, I was sure I needed to get the bios on a flash drive and it would boot up, sorry to say HP support did not help as every time I tried to get to the bios download it said this  may take up to three minutes and just stayed like that, even took my mom shopping when I got back it was  just the same, anyway to get to the point on my three days of looking I remembered somewhere I read a guy has the same problem after taking his pc to bits, his fix was as simple as resetting the date and time, so I looked at mine it said 1.1.2018. so set it to the right date 2022, saved changes and exited, to my utter astonishment the pc booted up and is now working fine, I know next to nothing about computers and how they work but I guess the hard drive been disconnected from the battery when I cleaned it was the culprit or me for doing it. Hope this info may help someone.