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Fix 1. Check and reset bootable device of the operating system in BIOSTo exclude the possibility that your computer is wrongly set to boot from unbootable disk or device, you need to check the BIOS settings. Here, we take the hp computer as an example. To restore BIOS settings and make Windows OS detects the bootable hard disk, do as follows.1) Press the Power button and press F10 key repeatedly to enter teh BIOS setup menu. (depending on different manufacturer, instead of F10, it's maybe ESC, F1, F2, F8...)2) On the BIOS Setup screen, press F9 to select and load the BIOS Setup Default settings.3) Press F10 to Save and Exit.4) Use the arrow keys to select Yes, then press Enter when asked Exit Saving Changes?5) Follow the prompts to restart your computer.If resetting the boot order solves the problem, good luck for you. If not, the issue can be a little tricky. Pay some effort with the workaround of?How to use Bootrec.exe in the Windows RE to troubleshoot startup issues.I know that the tutorial is so complex that many average users can't read further after the fist paragraph. In order to make the troubleshooting a little easier, you can take out the internal hard drive that was used to boot Windows, and connect it to a normally functioned computer.Note?- What you'll need is EaseUS Partition Master. Since you can't boot up the system on your current computer, you have to download the?partition magic software?on another workable PC and proceed with the detailed guide below.Fix 2. Test hard drive problem & fix bad sectors on the bootable hard disk1) Launch EaseUS Partition Master on the healthy PC, make sure the internal hard drive has correctly connected and detected by Windows. Right-click on the target disk partition and select?Check partition.2) On the check partition window, there are 3 options to go, check the options of "call Windows chkdsk to fix errors if found errors" and "surface test". Surface test will mark the bad sectors red, so when the erros were found, chkdsk utility will launch automatically to fix the errors.3) After the automatic fix, connect the repaired hard drive to the original computer and try to boot from it.Fix 3. Fix damaged MBRAs for you information, the Master Boot Record (MBR) is the information in the first sector of any hard disk or diskette that identifies how and where an operating system is located so that it can be boot (loaded) into the computer's main storage or random access memory. So, boot device not found error can typically happen when MBR went wrong.Still, EaseUS Partition Master can repair MBR in Windows 10, 8 and 7 easily with its "Rebuild MBR" feature.?1) Launch EaseUS Partition Master on the healthy PC, make sure the internal hard drive has correctly connected and detected by Windows. Right-click on the target disk and select "Rebuild MBR".2) Choose the proper operating system version.3) Confirm the operation and click "Apply". After the automatic fix, connect the repaired hard drive to the original computer and try to boot from it. ................
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