For all the computer experts??

My computer is on, my printer is on, the power to my monitor is on,.......however I have a black screen....no picture just black....i can't seem to boot up the windows picture??
Anyone know what i can do before I call someone over to fix it. Someone said it could be my video card...

Help Please...
Update: Yes... everything is hooked up right!!
Update 2: Right.....Philip T there was a power failure...and I think it happened after that.....
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