OK so I have a dimension 2400 that came with a pentium 4 1.40 ghz cpu I just upgraded it to a pentium 4 2.80 ghz at the same time as this I upgraded to 2gbs of ram, a new sound card, a new power supply, and a nvidia 6200. Everything seems to be working fine with everything but the other day I noticed that my cpu useage was at 100% by just checking my email so I went into system information and windows does pick up my new cpu but then I rebooted and went into my bios and the bios has the clock speed still set at 1.40ghz and I can not change this. I am looking for some advice on what I need to do to fix this so I can use the cpu at its full potential. Please any advice will greatly help me on what I need to do. Also my BIOS version is A05 which according to dell that is the lastest version.