[SOLVED] How to solve the random restart of my PC?

Sep 16, 2019
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Hi! All. My PC is restarting randomly even in BIOS screen. It just loose power for 2 sec and then starts automatically. I am having this problem since June,2019. But now it has overwhelmed me. My PC can't even run for 5 minutes. My specs are,

Intel i3-7100
Gigabyte H110M S-2
8 GB RAM of Corsair 2400 MHz
NVIDIA GTX 1030 2GB GDDR5 GPU
Corsair VS450 PSU
1 TB HDD of WD Blue
Windows 10 (1903).

The PSU output voltage is 11.80-11.90 V. I have changed the thermal paste. Clean installed Windows. Reconnected the RAM and GPU and also everything else. But the problem is still bothering me.

If anyone can help me then that will be amazing.