hi I have a NVIDIA GEforce 9800 GTX graphics card and a Dell model number SP2008WFPt monitor. it's a really nice monitor but may be getting old now. my computer is almost 6 years old, but I need to figure out why it has been (only since last night) blacking out and sometimes even flashing, then it will return and when I boot up, on the opening screen there will be green dots in lines of three going verticle everywhere. I already checked the hardware, did a system scan ( no viruses found) and got all the necessery drivers. can anyone let me know what it might be? It works just fine in safe mode, so I know it's not loose hardware, it must be a software issue or something. please help, thanks! it usually blacks out when I try to watch a video or play a game, hope that info helps.