Graphics card not working with monitor

[elcold]

One of my friends gave me one of his older comps to set up a mini lan at my house, but I have a problem. Any monitor I connect to it does not work(says either no input or just stays black), the graphics card is a XFX 6800 Nvidia, and I have to use a DVI to analog converter since I dont have any DVI cables around. Anyone have any advice to fix this?

 

[elcold]

Im pretty sure the graphics card is good, but im not sure if the system is booting.

 

[randomizer]

Does the monitor go into standby straight away, or is it on but just black?

 

[elcold]

It is on just black, cept for the one that says no input.