Intermittent cold boot problem

[spluff]

My PC has been running fine for 2 years but recently when cold booting my system doesn't power on at all.

The internal power button is illuminated on mobo but no fans run...

This is intermittent and after a bit of switching on and off it eventually boots.

Any ideas what could be causing this problem?

Cheers

 

[spluff]

I was thinking it was that as well but have nothing concrete..

Unfortunately I don't have access to another PSU.... its a Corsair 850 AX and I think it has a 7 years warranty on it....

I am not sure what I should do? How can I get it replaced/fixed under warranty if im not 100% sure its the PSU?

Thanks for your help....

 

[spluff]

GByte GA-Z77X-UD3H Z77 MoBo
Intel Core i5 3570K s1155
8GB 2x4GB CML8GX3M2A1600C9 LP
850W CORSAIR AX PSU
2GB GByte GTX670 Windforce
2 SSD Drives

Sounds like a good idea, but if it isn't the PSU I will have 2 PSUs