PC Peripherals [Hardware Query] Is it the power supply or motherboard at fault?

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chiragwarm

Beginner
When I switch on my computer, the machine starts and then pc shuts down in 5 seconds nothing being on the screen.
The motherboard's LED is on.

When I remove RAM and then switch on, there is no beeping sound that usually comes.

What can be the possible error? Is it the power supply or the motherboard that needs replacement?

Hard disk is fine and checked.
I can't find another power supply to use on my system and check.

P.s.
Previously, the power use to be on forever but since few days it shuts down in 5 seconds.
 
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