Orpahaned PPC640

Hi, I have found a PPC640 abandoned and homeless, just the PPC nothing else. Plugged in a power supply and turned on. Lights, camera, action. Sort off. The yellow LED beside the CRT label is on and steady and the red power LED is on and steady also. The built-in speaker however is continuously beeping. The volume control has no effect, surprise, during the attempted boot up. That's it nothing else. No LEDs turn on for drives A or B. No display changes on the built in monitor. I have set the DIP switches as you have recommended, in your answer to an inquiry dated Fri July 21:04:02, but no change from either option. A lost course perhaps? I only have knowledge of the Amstrad range via my old 286 but was intrigued when I saw this 'laptop' all alone in a parking bay. Any directions would be greatly appreciated Keith