M2-ATX 160 / OPUS 320 ATX vs AT power?
A while back I purchased an M2-ATX from the store here and had some problems with it. It powered my system fine, it simply would not turn it on and off reliably.
I spent a while in the forums with people and their conclusion was that my rig was too powerful for the 160W psu but this seemed a stretch for me. I bought an OPUS 320 though to see if that cleared up the problem.
The OPUS acted the same way upon initial install. If I left the power switch under my manual control then the psu provided power just fine. I just couldn't get the psu to turn my machine on and off.
On a whim I thought I remembered seeing some kind of power switch mode option in the manual so I looked and found the AT operation setting. That worked and continues to work like a champ.
I didn't go back to look and see if the option exists on the M2-ATX because I just figured I would stick with the bigger one.
Anybody know why this might have happened? Why do I have to put the psu in AT mode when it's an ATX motherboard?