I installed a new cpu ;Intel Celeron Dual-Core E3300, Freq: 2.55GHz, FSB 800MHz, Cache 1M, Socket LGA 775. When I turned the computer on, everything sounded like it was starting up, but the monitor stayed blank. When I put the old processor back in everything worked fine. My motherboard is an ECS 945G-M3. What are the possible problems? Is there something I need to update first?