power supply hums when computer is off

[nortexoid]

unless i actually turn off the power supply with the switch on the powersupply itself - if i turn it back on....hummmmmmmm

what the hell is this?...it's a century electronics 300watt...piece of crap.

 

[skace]

Hehe, nice power supply. Fan never shuts off?

 

[dkozloski]

Unless you unplug an ATX supply it is always putting out +5v to the motherboard. This keep-alive voltage allows for soft starts.

 

[nortexoid]

really...nonetheless, why is it humming?..when i first bought it it never did it...

none of my other PSUs did it..

i'm tossing this one in the junker as soon as i get a new case...

i should urinate on it first...and then again, and again, and again, ad infinitum..

 

[skace]

Humming usually comes from the fan not the actual PS. Is the fan turning off? We had a computer here at work where the fan just would never shut off, ended up replacing it.

 

[nortexoid]

the computer is OFF, hence the fan is not spinning, yet the PSU is humming...one of thsoe moderately high pitch ones...

 

[dkozloski]

Maybe it doesn't know the words.

 

[Gunbuster]

It just wants to be like a emachine power supply.

 

[NuovoTech]

>one of those moderately high pitch ones...

I have 4 PCs, that all make that noise, unless I unplug them from the wall. It's normal, comes from +5vSB to MB, get on with it!

 

[nortexoid]

nuo - normal?...

then all the PSUs i've previously owned were abnormal

i think i like the abnormal ones better...not the quasi-emachine ones..gunbuster?

 

[TheCorm]

My Aopen 300w PSU makes a high pitched hum, works fine though.

Corm