PSU stays running after shutdown.

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Xeon79

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Mar 7, 2013
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I have a few year old Ocz modxtreme 650w and everytime I shutdown, the system fans keep running. Also, I can eject my dvd drive in this state aswell.

To see if it was system or PSU related, I yanked the PSU, and apon just plugging the cord in, it will turn on automatically, without being hooked up to anything. It just started doing this recently. I thought something could be shorting out, so I took it apart and blew the dust out, but it is still doing this odd behavior, however, it has seemed to be stable in windows since it started about a month ago.

The only way to cut power is to flip the switch on back. It doesn't really hinder me much aside from pulling watts when not used. I can cut my system off and back on again via the power button, and even though power isn't cut to the fans or components, it functions normally otherwise.

Anybody ever seen this before? Might this be the first stage of imminent PSU failure? And should this happen, is there the possibility of it damaging other components? Being a quality PSU when it came out, I'd imagine there to be some over voltage fail safes, etc., but I just wanted to throw it up as a general concern. I had planned on replacing in a couple months anyway.
 
Yes your PSU is about to die and could be dangerous it could overload and fry your hardware let alone a small chance of starting a fire.

I would start looking for a replacement.
 
*scratches head* There never was a ModXtreme 650w, nor would I call much of OCZs lineup "Quality"

Have you tried another PSU? Seems like the easiest way to see if the PSU is causing it or some other component.

Used to have a usb hub that connected to two ports for additional power, and when you hooked one side to the onboard USB and the other to a PCI USB controller, it would keep the optical drives powered.
 
You have a flawed unit.

A PSU should not start or power anything unless a pair of pins on the 24pin are shorted... That ypur unit starts without being plugged into a motherboard means you have an internal short, either melted insulation in the cables or inside the box itself.

Either way, get a new psu before you fry or set fire to something
 
It's possible the circuit that generates +5Vstandby, which powers the chip that controls the PSU, including its on/off button, has failed and is putting out too much voltage.
 
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