Well it would help if you'd follow some suggestions, like trying it out on another monitor. The fact that you ran it on a different lcd in the past doesn't really help. Take your computer to a friend/parents/relative's house or something and hook it up to their computer to know for sure. Heck buy a crt at a thrift store for $5 and try that. It's only way to know for sure, there's no magic answer here. You've got to troubleshoot.