I have a desk top tower pc. It has 2 graphic cards 4 monitors. Haven't used it much in 6 months. I went to turn it on the other day. only 2 monitors showed graphics after booting up and no the other two. I decided to turn it off and went in and pushed on everything inside to make sure its seated. I went back since to power it up and now no screen shows anything. I replaced the cmos battery to no changes. Any help would be appreciated.