Okay, I recently came across an RP250, and it worked great. Everything was in complete working order, all the knobs were in place, the pedal worked, and it could cycle through all the presets. I plugged it into my Line 6 - Spider II, amp, played a bit, then unplugged it and put it away. The next day I go to turn it on, and all I see is a row of green 8's where the numbers should be, it's unresponsive, and makes no sound at all. Has anyone ever had this problem before me, if so how did you go about fixing it, because I don't really like the idea of blowing another $150 getting a new one.
Have you tried a factory reset on it?

Hold down "store" as you power it on when it says "fcrrest" or whatever on the screen let off and it should reset.