Peers, Got my self a second used MP 1.1 w/2x2.66GHz E51xx series today, which when powered on, just stays black screened. Fans starts, diagnostic LED for CPUB went red. So I pulled out CPU B, this turned off the LED, but no more than this. Pushing diagnostic switch makes power LED go green, first LED flash yellow and GPU flashing green, tried SMC RST also no difference. Should I be able to boot with only one CPU in my MP? Any hints are welcome on possible cause, Thanks!