Please help computer not starting

[cwtaylor]

Right first of all heres my spec:

Antec 900 case
Asus M2n Sli deluxe mobo
AMD Athlon 64 x2 6400+ Black Edition CPU
Artic cooler 64 pro cooler
Corsair 620w PSU
Samsung 500gb hdd
Samsung DVD-RW
Geil 2gb Ram
OCuK Value Graphics gar Nvidia 8400


All these are under 4 months old. Never had any problems and i built it myself.

Today i took my pc to my scout meeting no problems as usual. When i get home i plug it all in and it revs up then turns off. Same always, like if you dont have the 12v line in.

I have removed everything except for the Mobo psu line and 12v line and cpu and cooler. Still the same.

Already looked on some sites most say its the psu, but dont want to get going with a return if its something im forgetting to try.

Guys, please help see what you can do.

Thanks in advance, Chris.

 

[BillytheImpaler]

Are you getting any beeps from its speaker? Is the RAM well seated? Do you have another PSU with which you can test it?

 

[Roadshowuk]

I know it's stupidly simnplistic but we had something similar when a cpu heatsink had become dislodged after moving a pc. Might be worth making sure it is seated properly.

 

[cwtaylor]

right well my mate and me have tested my psu with another mob and its fine. We are gonna check the heat sink later cos i think it looks weird.

I think the speaker connection is buggered as no beeps at all.

My mobo is B-grade? will that affect the overall system warranty.