Why isn't my monitor and display adapters on my device manager?

Dual monitor help please?

• Ok, so I hooked both of them up, first off, if I hook up one of them with the cable that's attached to the monitor and has a blue head, I get a message when I boot my computer that says this computer has an add-in graphics card but the monitor is hooked up to the video something, I can't remember what it says exactly. So I have to hook up this other cable with a white head on both ends to my computer and the monitor, and then it works. So then once the computer started, I hooked the other monitor up with the blue headed cable attached to it, thinking that it would work since the default monitor is hooked up where it needed to be, I go to the display properties and click enable on my second one. I click extend my Windows desktop onto this monitor, and it says it's enabled, but it doesn't work, and then if I click anything else it says it's disabled again. I went to device manager and looked at my display adapters, it says I have Radeon X1300/X1550 series, and Radeon X1300/X1550 Series Secondary. I thought that if it said secondary that meant I had two display devices and could hook up two monitors. Am I completely wrong? I've looked up a whole bunch of different things that could be wrong, so I'm willing to bet I need a different card to hook up my other monitor, but I just wanted to ask on here to be sure.

• Answer:

  if you have 2 DVI OR VGA outputs on your pc then you are suppose to be able to run 2 monitors, which sounds like you do. Just have to ask, do you have power to both monitors, power buttons in on position, or try turning pc off, make all conections and then turn pc back on. Just trying to cover all the bases. hope this helps