It happens especially when performing heavy tasks such as graphics rendering, video editing, and gaming.
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Fix 2.
In this case, you need toclean out the dust on the fanand peek if the problem is improved.
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Fix 3.
Also, you should reconnect them to your setup and verify the connection is secure.
Fix 4.
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Right-click theWindows logobutton on the taskbar and chooseDevice Managerto open it.
Double-choose theDisplay adaptersoption to expand it.
Right-click your display card and chooseUpdate driver.

Just choose the one that suits you and complete the driver update.
What can you do if your PC keeps restarting after installing new GPU?
Here are some feasible and simple workarounds.
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Fix 5.
This could be a system failure resulting from poor RAM contact.
Fix 6.
Clear CMOS
BIOS setup errors may also cause system startup problems.
Clearing CMOS is the process of clearing the information stored in the CMOS chip on the computer motherboard.
So, you’re able to try using this way to fix the problem.
Typically, there are several ways to clear CMOS.
Bottom Line
PC turns off and fans speed up on Windows?
it’s possible for you to fix it by trying the methods listed above.
Hope the information we provide is beneficial to you.