Phantasy Star Online Ver.2 Problem

[hotdog55]

Hi.. i was playing the backup of PSO ver.2 and right after i finished the battle of training quest the screen turned dark, the music kept going but the machines wasn't reading (no sounds)... i waited for 5 mins and nothing happened so i open up the lid, took out the cd, and closed it but only the music stopped, the screen remained black........ does anyone know what's wrong with it??? thanks a lot~