New PSU doesn't work with one of my PCs

[NeoPTLD]

Ok, so got an Antec EarthWatts 500 since I wanted more Molex connectors.

It doesn't work AT ALL with my Gigabyte GA-7DXR board. Power LED doesn't even come on. A diagnostic LED on the board flickers and that's it.

Old 250W PSU + GA-7DXR = fine
EarthWatts + Intel board PC (with 20 pin connector) = fine

EarthWatts + GA-7DXR = not even power up.

The EarthWatts doesn't have -5v and I thought that was the cause. I have a scrap Ultra Products 400W PSU and I actually cut the -5v between the unit and the connector and GA-7DXR actually powers up.

For some reason, the board doesn't ok powering the PSU.

 

[eplebnista]

I have run into the same issue with an earthwatts 380w and a foxconn s939 nf4 motherboard. I basically came to the conclusion it is a timing issue with the "power good" signal from the motherboard not being able to switch on the PSU correctly.

 

[GeezerMan]

The Earthwatts 500W has a minimum load requirement on the 12v, 3.3v, and 5v

 

[NeoPTLD]

Originally posted by: GeezerMan
The Earthwatts 500W has a minimum load requirement on the 12v, 3.3v, and 5v

That's not it.
My Intel board use even less power than my system with Gigabyte board and runs fine.

 

[NeoPTLD]

bump

 

[mpilchfamily]

May be an issue with the board and the PSU not sinking up or somthing. I've heard of this before but don't know why its a problem or how to fix it if you can. Try RMAing the PSU and getting a new one. If the problem persists then you will need to go with a different model/brand.