Anyone did a lot of work on PC Power Supply?

[Cheapest]

Question:

Is all PC power supply fan run all the time when the power cord plug in the power and NOTHING connect to the other devices like motherboard, CD-rom, hard drive, floppy drive...(In other word the PC Power Supply alone)?

 

[Sheriff]

No I believe @least the ATX plug connected then the PS enacted from the MoBo Pins

 

[beatle]

Yes, you can run fans off the PSU without it being plugged into the mb. You just need to jumper the green wire (there's only one) and one black wire (of the 3 available) to turn it on. If it's an AT PSU, there's no need to do the trick, just flip the hard switch. I use an AT PSU for testing fan volumes.

 

[Mday]

you also need to make sure there is enough of a load on the powersupply for it to stay on. typical is 10%. this means, you should run something that uses at least 10% of the power the powersupply is capable of outputting.