I recently switch from a dual core to a p4, I know its sounds like a down grade but the dual core was giving me problems and a tech I was talking to said Dual cores have problems core 2 would be better. Since I wanted a cheaper alternative and only need this unit for Internet an minor business apps. I went with Pentium 4. After the change, the screen stays black, no boot pages or anything. Can some one point me to the correct action to fix this.