Installed new PSU and getting power, fans but no motherboard lights and no signal to monitor

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snowman311

Commendable
Oct 23, 2016
11
0
1,510
I just installed a new PSU (Evga Nex750G) because the fan came apart on my old one. I got everything hooked up and when I turn it on all my fans and cpu power up but my power and reset and dr debug lights on the (Fatality P67) motherboard are not lit and im getting no signal to my monitor.
Here is what I have tried
Unplugging and replugging all the psu cables
removing the ram and installing new ram and neither work but they work in other pc
removing the bio battery
clearing cmos

I have searched the forums and cannot find any other solutions
Im not sure where to go next. Any help would be greatly appreciated
Thanks
 
Solution
T
1. That PSU is fully modular. Verify that you have both cables (ATX, EPS1) use for the MB power seated firmly in the PSU end as well as on the MB. Sounds like you are not getting power to the MB.
2 Reinstall the old psu and run for a few secs. The bad fan is not a problem until the unit has time to heat up, which should be a min or more. See if you get power.
3. As Veldrane says, very nice PSU. If PC fires up with the old PSU then you need to RMA it.
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veldrane2

Reputable
Dec 8, 2015
89
2
4,665
That is a very nice PSU. Unfortunately you might have gotten a dud. If everything is plugged in correctly, then its either your PSU or mobo.

Consult the technical docs on the PSU, then power it up just by itself, get a meter, and test each pin/rail. If you do not know how to do that then you will need to talk to someone that does. If the voltages and amps check out correctly coming of off the PSU, then its your board. It might have taken a dump when your old PSU went out. If one or more of the pins do not check out, then like I said, you unfortunately got a dud. RMA it.

On rare occasion it can also be a wire that came of off the connector, or one of the connector pins on the cables becomes depressed and doesn't make full contact, or a wire will break inside a cable. You can also check easily for broken wires with the meter and visually inspect the pins on the cable.

Take some needle nose plyers and gently tug on each pin sticking out, see if any are loose. If one or more are loose, then they will not make a good connection and you have a definite RMA reason right there.

The PSU documentation will also let you know what values to look at across which pins.
 
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tsnor

Splendid
Nov 20, 2008
3,702
2
24,965
1. That PSU is fully modular. Verify that you have both cables (ATX, EPS1) use for the MB power seated firmly in the PSU end as well as on the MB. Sounds like you are not getting power to the MB.
2 Reinstall the old psu and run for a few secs. The bad fan is not a problem until the unit has time to heat up, which should be a min or more. See if you get power.
3. As Veldrane says, very nice PSU. If PC fires up with the old PSU then you need to RMA it.
 
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