1. My monitor is a SyncMaster 940BW.
2. I've noticed another problem, which may be unrelated to the one reported: all my efforts to squeeze audio from the pc, failed. The system doesn't have an internal speaker, and therefore, I don't know if the BIOS produces an initialization audio. Still, I tried to connect a 5.1 loudspeaker system, but the system stays quite.
My original suspicion was of a faulty MB, which may explain both the initial black screen and the lack of audio. Your suggestion leads to the existence of two unrelated problems.