I have an enermax 550watt power supply and an Nforce4 motherboard. Has anyone seen or heard of the following happening... Last night I shutdown the PC and then switched the power supply off at the back (I normally don't switch the power supply off) but in this case I did. Now the thing is about 30 seconds later I turned the power supply back on and pressed the PC power on button ..and no go, absolutly no life what so ever. Unplugged the power supply and left off for 1 hour, plugged back in and same again no go. Left it untouched over night then pressed PC power on in the next morning and all was fine machine powered on no problem..? This sounds like some saftey cut off or something on either the power supply or the Nforce4 motherboard. Anyone seen this before? Any thoughts would be appreciated thanks. Cheers Vince

I would suspect the switch is kinda flakey. I would avoid using it. Do yourself a favor BACKUP!

Yes, a switch that is little used often plays up. If you unplug, then switch on and off quite a few times it will probably clear the tarnish of the contacts inside and cure it. On the other hand you might prefer to leave well alone - which is quite an idea. DerekW

Hmmm, thanks for the suggestion however I am not convinced that its the switch as I flicked it on and off quite a few times last night thinking it was that too. I have a window on the side of my pc and when the PC is off you can see a little LED showing if there is power getting to the system board, that light was not on last night however when I walked in this morning the LED was on. Its almost like there is a saftey where something needs to cool down or something? I personally think that this must be something to do with the enermax power supply Anyone else have any ideas?

Read Derek's response again. Electrical connections that are not used for a time tend to corrode. Do yourself a favor BACKUP!

I have one Enermax PS that gave me problems like that when I first installed it - I unplugged / plugged back in the main connector from the PS and it hasn't happened since. This same Enermax would sometimes boot up the computer when I flipped a switch on my old power bar, which had seen a lot of wear. After changing to a new power bar, that realy happens. Your Enermax does have anti-short protection, and it's possible the switch on the back created electical or electronic noise when it was turned back on, that triggered the anti-short protection, and there's some kind of time delay before it will allow you to try to start up the PS again. Maybe just avoid using that switch.

Cheers for that, I have been reading on the enermax website and it seems that my supply has the following protections in place OCP -Over Current Protection, UCP -Under Current Protection, OVP - Over Voltage Protection, OLP -Over Load Protection, OTP - Over Temperature Protection, SCP - Short Circuits Protection. so yeah electronic noise on pressing the switch may have triggered something here putting it into a delay period. Might try using electical circuit cleaner on it or else as Tubesandwires said, avoid using the the switch :) Thanks