Hi all, just bought a Model A to go with my model B. To test the device I unplugged my existing Model B and used the SD Card, HDMI and power cable to plug in to my new Model A... Nothing. No boot up, just a dim (it's on, just much less bright than on my Model B) red light that pulses slightly for a while, gets dimmer then goes out altogether after 10 seconds or so.
Is this a dead Pi or is there something I'm likely to be doing wrong? The Model B starts up perfectly when I plug everything back in there.