Dead pc, psu question

[Paul11]

i have a mate with a dead pc, im guessing at either a dead psu or dead motherboard

what is the minimum to connect for a psu to make it boot , ? is the 20pin plug enough?

 

[Robbie_G]

You need to have the 20pin or 24pin depending on the motherboard also you need to have the 12v rail which is either 4pin or 8 pin depending on your motherboard and PSU. If you have a graphics card that needs power you need to connect that aswell.

 

[Admiral Huddy]

As above but is the PSU fan spinning..

The best check to make is to turn off the PSU, remove the ATX connector, hotwire the PSU by placing a wire between the green pin and any black pin in the ATX, connect a fan to a Molex, then start up the PSU..

If the Fan spins.. faulty PSU. Otherwise it's a faulty Mobo.

While you are there, check the voltage using a multi-meter.

 

[Paul11]

motherboard only has a 20pin connector (doesnt have the extra 12v 4/8pinl connector that some motherboards to) its quite old, just has 20 pin + hard drive/CD and fans connected.

testing the psu with green/black short, and its dead but as i undetstand this doesnt work on all psu's ?

 

[Paul11]

If the Fan spins.. faulty PSU. Otherwise it's a faulty Mobo.

no fans spin, but doesnt that mean the psu is dead?

 

[Admiral Huddy]

If the PSu fan isn't spinning then yes..

 

[Paul11]

just bought a new psu,will try it now


edit:

it was the psu, thank you all muchly