Well are you using a discreet graphics card or onboard????? What are your system specs Help us help you with this issue.... If your using onboard vid it will take some of your system memory also you most likely have one stick of ram not fully seated ... try reseating them and look again if the problem persist pull one stick out and see if the system works then remove that stick and replace with the other also your board what ever it may be see notes what are your system specs! should have 4 ram slots 2 may be colored blue 2 may be colored black make sure you have your ram install in either both blue or black slots only also see notes what are your system specs and what color are your ram slots hope this helps.