Computer won't turn on after replacing PSU

SleepyCarl

Commendable
Jun 3, 2016
1
0
1,510
My power supply stopped working recently so I replaced it. Previously the pc would turn on immediately after the power supply was switched on and all fans would spin except for the gpu fans, which would struggle to spin for a short time and then stop for a while before trying again, so I thought it wasn't getting enough power. But now with the new psu the pc won't start at all. I've ruled out the new psu being faulty with the paperclip test and the motherboard is definitely receiving power as indicated by my keyboard leds turning on. I've also checked all my connections and reseated everything several times. I even reset the bios and have tried shorting the pins for the power sw to force the computer to start, could my front panel connectors on the motherboard be broken?



Motherboard: GIGABYTE GA-990FXA-UD3 R5 (rev. 1.0) AM3+/AM3 AMD 990FX SATA 6Gb/s USB 3.0 ATX AMD Motherboard
PSU: EVGA SuperNOVA 850 B2 80+ BRONZE, 850W
GPU: EVGA GeForce GTX 970 4GB SC GAMING ACX 2.0
 
Solution
Checked that the CPU was seated properly and evenly?

The basic paperclip test is not really a good indicator of fully working PSU. Measure the voltages at the ATX main 20/24 connector using a digital multimeter, and ensure the voltages are at or very close to 12 V, 5 V, 3.3 V, -12 V, -5 V.

But even this test using the multimeter does not pick up all faults in the PSU. It is suggested that this PSU be tried in another computer, and/or try another known working PSU.
Checked that the CPU was seated properly and evenly?

The basic paperclip test is not really a good indicator of fully working PSU. Measure the voltages at the ATX main 20/24 connector using a digital multimeter, and ensure the voltages are at or very close to 12 V, 5 V, 3.3 V, -12 V, -5 V.

But even this test using the multimeter does not pick up all faults in the PSU. It is suggested that this PSU be tried in another computer, and/or try another known working PSU.
 
Solution