Then, BAK1 could not be mapped giving the same error. You can still handle the problem of “operating system not found”. When I removed and re-added the drive physically it auto mapped E to BAK6 unmapping it from BAK1. If the system partition or boot partition is not set to active, you may encounter the operating system not found issue.

If you don’t have this application or if you don’t want to take the risk, it’s okay to skip this step. When Windows is running under Legacy BIOS + MBR mode, the boot partition/system partition should be set as active so that MBR can pass boot right to boot manager and find Windows. You can safely use them and find out what condition your hard drive is in. All instructions for using such utilities are on the official websites of the companies that developed your motherboard. It almost always comes with the motherboard and you can check its availability on your computer by entering the BIOS.

Press and hold F10 and press Power button to turn on PC > Release F10 after the PC screen display you with test Use Right Arrow to select Tools menu in BIOS Setup Utility Then select Hard Drive Self Test > Press Enter to start the test 1. It is often possible to check performance using a special built-in application. Test hard disk drive and reboot computer from a WinPE bootable disk. Discover the magic of the internet at Imgur, a community powered entertainment destination.

Restart your computer after that, the OS should be working.

In different versions of BIOS, it has different names to not get confused, look for a word that has the word “Priority”, such as 'Priority Boot' (other names include “Hard Disk Boot Priority”, “Hard Disk Priority”, and “Boot Device Priority”).Īfter you set the boot priority from the hard drive where your system is located, do not forget to save the settings with the F10 key. To do this, turn on the computer by pressing the Power button while also pressing the F2, F12 or Delete buttons.Īfter that, go to the configuration section “Boot” and locate the first place in the column “Priority” the hard drive on which the working Windows operating system is.

No active partition found