Okay so earlier today I moved my PC downstairs to hook it up to my TV so i could watch a movie. I used a VGA splitter to graphics card and the one VGA cable to my pc monitor and another to the TV. It worked perfectly. Now I've moved everything back upstairs and I accidentally placed my VGA cable into my onboard graphics card, not my normal graphics card. So I noticed it wasn't displaying anything. So I took it out of the onboard grphics card(Intel) and put it into my external graphics card. It's not displaying anything still...? And also when i turn my Windows 7 Dell computer, it turns off, and then turns it self back on after 3secs or so.