Grundy Newbrain Computer wont power up.

Can anyone help me bring an old British Computer back to life. Last night I bought a early 1980's Grundy Systems Newbrain "AD" computer (See http://www.ndirect.co.uk/~e.tedeschi/picts/newbrain.jpg) The machine is in good condition, with original manuals, cables, psu, and even some software. Unfortunately it wont power up. Turning on, the LED display flickers and goes blank (although the manual says it should do this, although I don't get a test pattern which I think I should) On the Television/video output I just get a white screen. Does anybody know if these machines suffered from any common faults? There doesn't seem to be much information in any of the newsgroups, and apart from brief descriptions on web based computer museums, there is very little information available about this strange little computer. Any help or information, would be much appreciated. Andy