I recently completed building a pc that uses an Athlon xp 2800+ processor that was only running at 1.25 ghz. After going to amd.com I found a clock speed that was supposed to make the processor run at its regular 2.08 ghz. After I changed the clock speed and restarted the system and tried to turn the pc on again it just went on for about a second then turned off again. After I removes some of the parts such as the sound card and the pci lan card the pc will turn on however the screen is blank.