Hi, its a long story but let me summarize it. I bought a 2400+ cpu to install and it wasn't working. So im returning it b/c its defective. So i put in my old 900mhz chip and it works and everything but I usually have to turn it on and off twice to get it working. When i press on the first time, I can hear all the parts starting up in the case but theres nothing on hte monitor. I think somethings wrong with my mobo? why does it work when i press the on and off button twice.