No power and clicking noise

hi guys

I went away for a few days and turned the computer of normaly,then removed the socket from the wall..
Got back yesterday,pluged it in and its dead!! there is a flickering green light(at the back)under the power supply cable but no other sign of power anywhere…theres also a continuous clicking noise that seems to be coming from the power supply unit.

anyone any ideas?

thanks

Compaq presario
intel pentium 4-3 ghz
1 gb ddr-160 gb hd

The powersupply must be dead, replace it with a new one and it should work.
you say the green light is flickering on the back and you have a clicking noise coming from it? that most certainly is the PSU. Change it.