Is it connected to a good UPS (like an APC with AVR)?

As you boot-up, tap F12. See if it will pass ePSA Diagnostics (outside of Windows). 

In Windows Reliability Monitor report, do any critical red-errors show lately?

Have you tried other games and what are they?

If you require additional assistance here, some basic system-specs would be nice. Like what video card is installed.

If it's that new, you have the option to contact Dell phone-support.

I don't have any UPS connected. The PC passes all the ePSA tests with no errors. This happened when I was playing CSGO(online). 

The specs are:

i7 8700

16gb ram

GTX 1070

Thanks for the reply.

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@Scarface007 wrote:

How do I get into safe mode 

 

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Try this:

https://www.digitalcitizen.life/4-ways-boot-safe-mode-windows-10

But you have to be fast. Tap the keys quickly, but don't hold-down.

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@Scarface007 wrote:

1. I don't have any UPS connected.

2. The PC passes all the ePSA tests with no errors.

3. This happened when I was playing CSGO(online). 

4. GTX 1070

 

 

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1. Should get one. Not only to rule-out AC-power-grid problems, but to protect your investment.

2. Good, so ... 90% chance your hardware is fine. 

Windows Reliability Monitor report is good indication of system health inside Windows.

Here are some more tips if/when you can get back into Windows (maybe at first with Safe-Mode).

3. Try OCCT's Power-Supply Test (removes games from equation). CPUID's HW-Monitor (free) is also good.

4. Uninstall all Nvidia, reboot, and try clean-install (and this way) of this nvidia.com driver. It's an oldie but a goodie and highly stable.

https://www.dell.com/community/Alienware-General-Read-Only/Aurora-R6-Hard-Lockup-and-crash-while-gaming-SOLVED/m-p/5504128/highlight/true#M6104

There should be a Dell Recovery Partition.

You could try returning computer to it's Factory Fresh Shipped Software State.

I think here, see section:
Reinstall Windows 10 to the Dell factory image using the Windows Recovery Environment (WinRE)

https://www.dell.com/support/article/us/en/19/sln297920/reset-or-reinstall-windows-10-on-your-dell-computer?lang=en