My computer says "an operating system wasn't found" please help me

[Juan8]

I tried resetting my pc because my computer was really slow so i tried to, during the reset there were times where it failed to reset so I kept doing it and then a message showed up "an operating system wasn't found. Try disconnecting any drives that don't contain an operating system". Please help me. I really don't much about computers. And I also had windows 10

[WAWood · Accepted solution]

Juan8

Hello;

Allow me to welcome you to the HP forums!

According to the HP product page for your PC, it did not come with Win10 preinstalled.  SO that means you must have done the Win10 Upgrade.

While Microsoft tells you that there is no risk in the Win10 Upgrade, because they let you believe that you can always revert back to your original OS and setup within 30 days, the ugly fact of the matter is that the Win10 GoBack function has proven to be unreliable -- and when it fails, it can leave machines in a corrupted state -- which doesn't always happen, but it does happen often enough to be a problem and you won't get any warning in advance that it is going to trash your PC!

If that is not bad enough, the Win10 Upgrade is know, in some cases, to corrupt the Recovery partition stored there by the OEM that built the original machine. This pretty much guarantees that no HP Recovery is going to work.

The problem you mentioned is generally due to one of two basic problems:
1) Failed hard drive
2) Corrupted/missing boot loader files

As to the first, please follow the directions in this link for testing your hard drive: http://support.hp.com/us-en/document/c00439024

If that confirms your drive has failed, then you need to replace it.  Please report back if that is the case.

As to the second, you will need access to a working PC for this step in order to create the media needed to repair your PC boot loader.

Once you have that, please download and create Win10 install media from this link: http://windows.microsoft.com/en-us/windows-10/media-creation-tool-install?ocid=ms_wol_win10

Note that when you go do download and build install media, the tool defaults to matching what is already installed on your PC (as in, Home for Home, 64-bit for 64-bit).  While you CAN change these settings, do NOT. If you do, the resulting media will be different and will force you to enter a NEW product code!

Boot from the media you created, and follow the directions in this link: http://www.tenforums.com/tutorials/2294-advanced-startup-options-boot-windows-10-a.html

You will need to go to the Advanced Options screen and click on Startup Repair.  You will probably have to run Startup Repair three times for it to fix all the boot loader problems.

When done, your PC should boot OK.

Good Luck

[Juan8]

I would like thank you! I did everything you asked me to do and everything worked thank you so much!!

[WAWood]

OK ... then please click the white thumbs-up symbol on my thread ...