Why is my laptop stuck on a blue screen

As the error message says "unmounted boot volume". In other words your boot drive has probably become corrupted.

Here are three possible fixes

Fix UNMOUNTABLE_BOOT_VOLUME Windows 10 blue screen error with Automatic Repair

Using Automatic Repair is the easiest way to fix problem of this kind, if it works.

a) On the Windows Setup screen, after you finish choosing your language, click on Repair your computer at the bottom left.

b) Click on Troubleshoot on the next screen.

c) Click on Startup Repair on the Advanced options screen.

d) Select Windows 10.

e) The repair will be started immediately. Please wait patiently for the process to be finished.

Fix UNMOUNTABLE_BOOT_VOLUME error by Fixing Master Boot Record

Master Boot Record (MBR) identifies where and how your operating system is located so that you can boot your computer normally. A malfunctioning MBR can cause problems such as UNMOUNTABLE_BOOT_VOLUME.

 a) Repeat the steps in method 1 until you see the screen of Advanced options.

b) Select Command Prompt.

c) Type “bootrec /fixboot“ ''''in Command Prompt, and then press Enter.  Repeat with “bootrec /rebuildbcd”

d) Wait for completion of the process, and then restart your computer to see if the error message shows up.

Fix UNMOUNTABLE BOOT VOLUME error by using Chkdsk command.

UNMOUNTABLE_BOOT_VOLUME error can be caused by problems on your hard drive. You can run Chkdsk command to check up and fix these  problems.

a) Open Command Prompt on your Windows 10 media as the steps above show.

b) Type in “chkdsk /r c:“(Note that “c:” here refers to your boot drive and replace this with the letter you use in case your boot drive is not C Drive) and press Enter.

c) Wait for completion

There you are. Give it a try.