Urgent PC Help!!

[b3nje]

Fitted a new power supply to another PC...when i plug power in the lights flash on the pc then go off. I press the power button and nothing happens


I can unplug it and plug it back in and it will just do the same.

If i turn it off at wall and plug it in the turn plug on it does it again.

Is the power supply setup wrong!?

Can someone suggest the problem please! many thanks, ben

 

[KDF]

Sounds like you dont have the atx power supply plug connected to the correct pins on the mobo..

You can test it by shorting the two pins on the mobo manually (the ones that say power switch or simmilar)

 

[b3nje]

it has started up like this before though..

only once

 

[172beast]

Sure you've plugged everything in right? In particular the small 4 pin connector that goes near the CPU, thats a easy one to miss.

 

[b3nje]

 

[b3nje]

Yep its there plugged in at bottom left of the big fan!

 

[Karl3158]

Un-plug everything, hard drive, cd rom etc, then try powering up, may be overloading the PSU.

 

[b3nje]

 

[b3nje]

everything is unplugged nd its still doing it

 

[Karl3158]

everything is unplugged nd its still doing it

Silly question I know.... but that's unlugged from the PSU, not just the Motherboard..?

Do you have another PC you can test the PSU in?

 

[byrnie]

have you got the wires that go to and from the switch and reset button in the right order? i did them in the wrong order once and that happened what you are describing. lights just flashed then died when powered up.

 

[b3nje]

i do but i dotn want to rip another PC about
its a brand new PSU though!!

its crazy!! there is obviously power going to everything but i dont know why it just shuts off!

 

[b3nje]

have you got the wires that go to and from the switch and reset button in the right order? i did them in the wrong order once and that happened what you are describing. lights just flashed then died when powered up.

??

I can't even press the button on the front, as soon as i plug the power in the back it does it!

 

[Karl3158]

Sorted.... the 4 ping plug that's tied to the ATX power needs to go in a pulg at the top left-hand side of the cpu, noted in the green box

Ignore that, the 4 pins I can see are for the 20/24 Pin ATX adapter plug :-(

 

[b3nje]

I havent touched the leads that go to the front switches either... heres a picture!

 

[b3nje]

 

[Karl3158]

That looks fine... I did have some PSU probelms when using on an AMD machine, the PSU worked fine in my Intel..

 

[Karl3158]

Thinking about it, I did have one pc that when unplugged from the mains then plugged back in, experienced the same symptons, after a few minutes the pc would power up.

 

[b3nje]

hmmfff

i'm gona try plugging it all back in

 

[KDF]

If your sure that you have everything wired up correctly then it is possible that you got a duff PSU, worth testing in another machine before you take it back though.

 

[b3nje]

frikking ebay wasn't it