Ok, this is a strange one, recently my Acer monitor has been going black every few seconds, the only thing I have added recently is an external sound card (Creative Omni Sound Blaster ), connected to PC by means of a USB and connected to my amp/receiver by an optical cable, the strange and illogical thing is I can watch a movie from my external hard drive without the monitor screen going black at any time, can someone please tell me what is going on ? I reset my PC to factory settings yesterday thinking that some strange virus had struck but the same thing is happening today, please help !!