Emu XL-7 & MP-7 User's Group

Any suggestions for solving the following problem (possible causes, 
solutions, things to check, etc.):

After not using the P2500 for about 3 weeks, I attempted to powerup. 
Almost immediately, all leds lit, all segments of the BPM display lit, 
and the top line of the menu display were dark boxes. The E-Mu stayed 
in that condition until >>manual<< powerdown.

--Steve