If you are:
1) Using windows
2) You do not have a monitor plugged into the video card you want to mine on
then the video card will be "disabled" and turned off.
You can either make a dummy plug or plug your monitor into it briefly.
-- round 2 --
Also make sure you have installed the latest ati/amd drivers. The ones that "comes" with windows update doesn't have OpenCL included with it.
Should be Desktop Graphics -> Radeon HD Series -> All Radeon HD Series AGP -> Then select your OS versionhttp://support.amd.com/us/gpudownload/Pages/index.aspx
Yes I'm running Windoze XP SP3.
And I do have a monitor plugged into it.
If I use the latest driver's it will blue screen and/or reboot. The comments on amazon.com said to not use the latest AMD driver's with this card and to stick with the ones on the CD. But I have tried several versions of drivers so far including the latest.
When I install the OpenCL GPU Caps viewer shows the CPU as the only available device.