Question How can I tell if PSU is faulty?

Nov 18, 2024
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I posted a query on the Motherboard forum re a blown motherboard and it was suggested that the PSU may be faulty. The issue is that the machine doesn't power on, zilch. If I unplug everything except the CPU and the 24-pin power connecter a transistor gets very hot, before any attempt is made to power on The issue began when the GPU was first installed, so that has damaged something. It came from an old Dell which had power on issues.

My question here is, how can I ensure that the PSU hasn't been damaged and is in turn damaging motherboards? Is it worth getting a tester? I have already done the paperclip thing and checked all voltages were ok, although obviously. not under load. I noticed that without the paperclip in some other pins had a voltage across them. Thanks!

Asus Prime B250M-A
Intel Core I5-6400
ATI Radeon HD 5770
Integral 16GB (2x 8GB
No SSD
No Soundcard
1TB SATA HDD
Corsair CX650 (Opened, unused, replacing 7yr old Corsair CX450)
Coolermaster Master case Pro 5
 
If I unplug everything except the CPU and the 24-pin power connecter a transistor gets very hot, before any attempt is made to power on
What is "transistor"? Did you mean cpu?
To start your system, you have to have certain things connected:
cpu, cpu cooler, cpu cooler fan,​
ram (single module),​
24pin power connector,​
4pin cpu power connector,​
power on switch.​
 
What is "transistor"? Did you mean cpu?
To start your system, you have to have certain things connected:
cpu, cpu cooler, cpu cooler fan,​
ram (single module),​
24pin power connector,​
4pin cpu power connector,​
power on switch.​
Yes, it doesn't start when all is connected. That's the original problem. So to try and find out why, I followed the instructions in the sticky post in the Motherboard forum to test a motherboard, this identified an issue as a transistor on the motherboard overheating, and someone suggested it may be a power supply fault.
 

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