i had just gotten a new monitor because on my old one the screen adjustor kept poping up. after setting up i had left the house for a while. when i came back, my computer was off and it wouldnt come back on. it would come on and then turn off before the normal beep that would come. when my son came back from work he tried taking the power source from his newly built computer and when we plugged it up it wouldnt come on. he put the other power source back in and it went back to the on then off thing and after a few more tries it finally came back on completely. i turned it off last night and it started doing it again. i just got it back on again and i need to know what's wrong. could it be the new monitor or what. please help!