HP 9830A always turns on with blank display

Hi all, I have a 9830A that I haven't powered up in a while.? Previously, it would take a few seconds to get to the lazy-T prompt, but now on powerup, the screen remains blank.? I got Tony Duell's phenomenal schematics, and was all set to start debugging, starting at the clock, but I checked the user manual first, and following the suggestion in the setup section, I hit "STOP", which brought me to the prompt, and from there, it appears to be functioning normally.?? However, the machine powers up this way every time--never to a prompt.?? Does anyone have an idea why the machine is behaving this way?? I'd love to have it power up to a prompt. Also, does anybody happen to have schematics for the infotek bitslice processor?? I don't have one, but I'd be very interested in trying to acquire or recreate one. Thanks, Dave