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Brand new PC randomly restarts

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Hi, I just got a brand new PC and on the day after I got it, it began to randomly restart itself (it does this by instantly shutting down, rather than showing the restart screen then starting again) It's a custom PC assembled by a friend of mine who has also built 3 other incredibly similar PC's all which work 100% perfectly

We thought it might be a power supply problem but we replaced it and the problem persists

It is definitely not an over heating problem we monitored the temperatures

I took it to a tech store and they told me to reset it which I did and the problem is still happening

I'm hoping to get some help here

Here's my specs
Msi b450 gaming plus max
MSI Geforce GTX 1660 super
AMD Ryzen 7 3700x
Corsair vengence DDR4 3200mhx 2x8 gig sticks
wd blue ssd 500 gig
seagate baracuda 2tb hdd
Corsair CX550m (this is the new power supply)

Would be very grateful for any advice you can give

TLDR; Brand new PC randomly restarts itself (it does this by instantly trun off and then turn back on rather than showing the restart screen), not a power supply or cooling issue
 
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