Clicking noise from psu

[thedaki75]

Hello!
Im having some pc problems and I think its either the PSU or the motherboard but I dunno.. There is a clicking noise ( kinda like a clock) coming from the PSU and nothing is coming up on the screen ( also it seems that the cd rom dosent have any power cuz the light isent on and it wont respond when I try to open it) What might the problem be?

 

[DeathAbyss]

Can you provide more details? Brand of PSU and how long you've used it would be good. Also, did you build a new computer, or is this a recent development?