If you do not have anything connected to the built-in video (you don't, do you, even a Mac-to-VGA adapter counts here) then the Mac should detect this and default the start-up screen and menu bar to the video card, which is the only video source detected to have a monitor attached.
If you do not have anything attached to the built-in video, but are still getting the symptoms you described, the first, easy thing to try would be to zap the PRAM. Boot up and hold down teh cmd, opt, P and R keys until you hear a second bong.
If that doesn't help, it may be that the Radius card is so old that additional gymnastics are required. My old video card days are long ago, so the memory is hazy, but I think if you hold down the R key during boot up (immediately after or even before the bong) that the Radius card will go into a set-up mode at start-up. I'm not sure about that R key thought. It might be the T key, for Thunder, too. I think E-Machines used the E.
If you do not have anything attached to the built-in video, but are still getting the symptoms you described, the first, easy thing to try would be to zap the PRAM. Boot up and hold down teh cmd, opt, P and R keys until you hear a second bong.
If that doesn't help, it may be that the Radius card is so old that additional gymnastics are required. My old video card days are long ago, so the memory is hazy, but I think if you hold down the R key during boot up (immediately after or even before the bong) that the Radius card will go into a set-up mode at start-up. I'm not sure about that R key thought. It might be the T key, for Thunder, too. I think E-Machines used the E.