Orange Dell

my dell desktop’s light is orange and won’t turn on. there is also a loud noise like a leaf blower from it?
um it’s a dell optiplex 320 and it’s less than 3 years old. The noise is very loud and i can’t get the computer off! =( please help! =S
What do you mean, you can’t get the computer off? Pull the bloody power plug, you idiot!
Dell Amber blinking light fix.”demensionsE510!!! no Power supply.