Question Power supply is behaving weird, PC turns on but after shutdown it doesn't!

[wifikills]

So, I recently bought a used 750w power supply for a cheap price. I didn't need this much power but still it was a good deal. I paired it with my pc it was running smoothly but yesterday my pc wasn't turning on, so with the help of youtube I tested the power supply by shorting the motherboard cable and the psu was running . Then, I connected it with my pc again and it turned on but when I shut down the pc it wasn't turning on again. So, I removed the cables and connected it again it powers on once or twice at max then it doesn't turn on again. So, I connected my pc to another psu which is very low powered and doesn't come close to this psu, and the pc was running smoothly on it. I should mention my pc currently doesn't have a gpu installed.

The Power Supply in question: Cooler Master MWE 750 V2 80+ Bronze
My setup:
Ryzen 3 3200g
Gigabyte s2h b450m ultra durable
4+4 2666mhz Ram
240 gb ssd + 1tb Hard disk

 

[Fix_that_Glitch]

You usually get what you pay for. Especially for psu's. You didn't mention what your pc setup is.

 

[wifikills]

You usually get what you pay for. Especially for psu's. You didn't mention what your pc setup is.

In idle mode my pc doesn't even take 100w of power, the Power supply has still have 4 years warranty left, that's why I bought it. But they will take at least 2 weeks to replace the psu. I've added my setup in the post.

 

[--SID--]

Cooler Master MWE 750 V2

Bronze, Gold, full range, 230v EU? Which one do you have?

 

[wifikills]

Bronze, Gold, full range, 230v EU? Which one do you have?

Bronze 230v eu

 

[Fix_that_Glitch]

If you possibly bought an open box then someone probably returned it for the same reason. I would wait for the new psu and see what happens.

 

[Roland Of Gilead]

So, I recently bought a used 750w power supply for a cheap price.

Ouch. Not a great idea. That PSU isn't the best, and it's components are medicore. Buying second hand, you just don't know what you will get.

 

[wifikills]

Ouch. Not a great idea. That PSU isn't the best, and it's components are medicore. Buying second hand, you just don't know what you will get.

I thought as I will never use full 750 watts of power this won't be that much of an issue! also there's 80+ bronze rating!

 

[--SID--]

Bronze 230v eu

That's a cheap one anyway. Must be almost for free when you got it used.

also there's 80+ bronze rating!

It only tells you something about the efficiency of the unit, nothing about quality and protections. MWE Bronze V2 230v EU is a budget unit with very basic input filtering for 200-240v mains only.