My pc will not turn on after power was shut

[MauraFinn1]

Hello,
My pc was shut down properly before power was closed from mains. Now it's just dead!

I've tried removing all connection to main power supply, and NOTHING, it just won't reboot.
It's a Dell. Help, PLEASE!!!!

 

[oztom]

Unplug the power cord from the wall outlet, wait a minute, plug it back in, and try to boot it up.