Laptop keeps rebooting before login screen appears

Hi, try Startup Repair - boot from a Win 10 installation disk, click 'Repair your computer' and navigate thru the screens to Startup Repair.

Download Windows 10 ISO File Installation Upgrade Tutorials

burn to DVD if you have a DVD drive or
Create Bootable USB Flash Drive to Install Windows 10 Installation Upgrade Tutorials

At this stage all you're trying to do is stop the boot loop.

Which version and build of Windows is installed?

(Booting to Safe Mode normally requires that you are able to at least reach a lock screen. However it is possible to configure a PC to boot to Safe Mode by booting from a boot disk and so to a command prompt, and using a bcdedit command)

Hi, of course you will be able to retrieve any data you've not backed up before doing so.

You may also wish to check the disk before proceeding further.

In order to protect yourself, your PC and your data, and save yourself from having to do a clean install in many cases, we constantly recommend the routine use of disk imaging:

Here's my write-up on the value of disk imaging.

Everyone who contributes regularly here uses and recommends disk imaging.

If you use it, you can recover from:
- a failed disk drive (restore to a new one)
- ransomware (which encrypts your disk)
- user error
- unrecoverable problems from failed updates to problem programs
- unbootable PC (hardware faults aside)

Images also act as a full backup- you can extract files too.

You can even use images to help you move more easily and quickly to a new PC.
Can be used with Laplink software to transfer your build automatically to another PC

Imaging can even help you sleep at night knowing you have a second chance.

Creating disk images lets you restore Windows and all your imaged disks and partitions to a previous working state from compressed copies you have created and kept updated on external storage media, quickly and probably without technical help.

Many here recommend Macrium Reflect (free) as a good robust solution and more reliable than some others. It’s
- more feature rich
- more flexible
- more reliable
than Windows Backup and Restore system images.

It's well supported with videos, help and a responsive forum.

There are other such programs, free/commercial, some with simpler interfaces, but Macrium R is one of the most robust and reliable.

How long does it take?
SSD+ USB3 - maybe 15 mins for the first system image, less thereafter
HDD + USB2 - maybe 40-50 mins
That’s with little personal data, few programs installed.
- of course, depends how much you have on C:
(You can and should image all your partitions and disks)

Once you've created your first image, keep it updated with e.g. differential imaging- which images just changes from the first image, more quickly, and creates a smaller image file.

You need a backup medium - say- twice as large as the total amount of data you are imaging to keep a reasonable number of differential images. This will vary dependent on the number of images you keep, so is only a rough practical guide.

Some comment that system restore isn't always reliable; if it works and solves the problem, great. But sometimes restores won't work or fail. And of course a restore point only covers a limited number of aspects of the system. That’s where disk imaging comes in.

(There's a tutorial on Macrium in the Tutorials section, and a couple of videos in the user videos section on this forum)
Backup and Restore with Macrium Reflect Backup Restore Tutorials
https://www.tenforums.com/general-su...tml#post355809

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Macrium automatically selects all the partitions comprising Windows if you select that option.

You can of course back up any combination of disks and partitions.