I don't know what RMA stands for but it means return, assuming its from newegg you can get an RMA number and return it within 30 days, it sounds like its POSTing (I've never heard of HD spinning up and no POST), it sounds like its POSTing but you're getting no display for some reason. Check the video card connectors, or try another video card, are you sure you grounded yourself and didn't fry something during the install?
XI Wiki

