Good question! This is an old pc that died on me a while ago. It doesn't boot any more. Fan is working, tried changing the ram, power supply working, so I presume it's either the mobo or the cpu. According to the manual, the cpu must have been an Intel Core2 Duo/Pentium D/Pentium 4. It's just a computer for the kids to use, so am willing to try changing the mobo.