It's really dreadful to start a day like this: You arrive at your office early in the morning, sit down and get down to the urgent work. Crap! The computer won't boot up at all. Reboot it, and still a failure. Most of computer users might have experienced this. Stay calm!
If there's no signal light on your computer when you try to boot it, it might be a PC power problem or hardware problems, you need to check it yourself or find some professionals to fix it.
Note: There is another reason for this issue: Graphics card failure. When Graphic card is failed, your computer can be running but it won't boot at all.
No matter why your computer won't boot up, the first thing you should do is to get a Windows bootable disk or CD to get your computer starting. Only the computer is started, you can troubleshoot other errors or problems on the system.
To solve this problem is quite easy. There are 5 things you can do to save your Windows back. First of all, you need to create a bootable disk, check out this page to do that.
When you start the computer, it always crashes with a black screen. There may be one of the following boot files lost. You can do a boot file recovery to get them back to normal. For detailed steps, check How to Repair a BOOTMGR Missing Error
* NTLDR is missing or corrupted
* Ntdetect.com is missing
* Ntoskrnl.exe is missing
* NTFS.SYS is missing
* BOOTMGR is missing or corrupted
* Hal.dll is missing
MBR, the short name of Master Boot Recorder, locates the first sector of the hard disk. The MBR is not placed in a partition but located at a main boot record area in front of (with a lower LBA sector number than) the first partition. MBR issues can bring you the hard disk boot failure. When it happens, you will see "invalid partition table", "hard disk boot failure", etc. on your computer.
For the detailed solutions, check out this post about how to repair MBR on Windows 10.
The partition boot sector is a small section of the hard disk partition that contains information about the operating system's file system (NTFS or FAT32), as well as a very small machine language program that is crucial in assisting the operating system as it loads. If you suspect that Windows XP won't boot because the partition boot sector has been corrupted, you can try to fix it.
You can use this command chkdsk C: /f (you can replace C: to any drive, you'd like to run a scan for, e.g. D:) to check and fix a corrupt file system.
The registry is a small database that stores configuration settings and options in Windows. It contains settings for low-level operating system components as well as the applications running on the platform: device drivers, kernel, services, user interface, SAM, and third-party application all make use of the registry. If the Registry is corrupted, it may cause the computer won't boot up. You may encounter a blue screen, blank screen, application booting error, registry configure error, etc. All these problems may be caused by the Registry abnormity.
The problem of Windows booting failure can be caused by different reasons, like corrupted or missing Windows system files; corrupted DPT (Disk Partition Table); damaged MBR, and corrupted registry. If you backed up your Windows/MBR/DPT/Registry before, you can restore it easily by clicking the button below when they crashed.
If the computer is running and you just can't boot it, you can fix this computer won't boot issue easily with a Windows bootable disk/cd. But if you have tried all the above methods and failed to boot the computer, the best choice to recover and backup files from the unbootable computer, then reinstall Windows 10.
Under these circumstances, Recoverit can help you to create a bootable media and recover all data from the unbootable computer.
With the steps below, you can conveniently recover all lost files from your unbootable Windows 10.