Hd4870 problem

[coleman]

last nite i was on my computer, i went to change the speakers over to the headphones, in the bk of the mobo. when i looked bk up at the screen there was no display :O

I have a had 4870 and have tried a number of different thinks, including:

using a different pci-e slot
changing commectors
removing other componants
different combinations of ram

then i tried my old gfx card, i think it is a geforce 8600 and i got display.

normaly i have a little idea what mite be wrong but i have no clue on this 1. there are three green lights on the bk of the hd4870 so i am guessing a ll is well.
thanks to all replies in advance

coleman

 

[daship]

You probably bumped the cord loose.

 

[coleman]

what cord?

 

[warmon6]

You probably bumped the cord loose.

what cord?

power cords to the graphic cards.

 

[FallenSniper]

So your computer is off. You press the power button. What happens?

 

[coleman]

the computer starts up like normal but there is no display. no different sounds

i have cheaked and double cheakes all cables and connections