So I have this BFG Geforce 9800GT passive cooling graphics card. And I installed it into my computer.About a month later I logged into my account on my PC and the monitor went to standby mode?But every time I log into my computers "guest" account,The screen comes up.I have a 500 watt power supply,I have 4 fans in my computer.Whats going on?I cant return the card cause the BFG company stopped making graphics card!!! Does it sound like my drivers or new card?Cause I remember 1 time the card quit working while I was playing Call of Duty(I didn't have a 500 watt power supply back then).