I've got an old Dell Dimension 4700 with an Intel 915G Express chipset. It's got a Pentium 4 540 processor. In addition, I have an old Pentium 4 661 just sitting around. Intel says the 915G Express is compatible with the P4 661, but when I put it in the Dell 4700, it just does the single beep and freeze act; no boot. The bios on the pc has been updated to the latest version (10, I think). Is there any way to make the P4 661 processor work in this 4700?