I have a dell XPS 710 machine and I wish to upgrade the CPU. I have purchased a Intel QUAD core Q9650 LGA775 CPU and updated the bios from version 1.0 to 1.4. On placing the CPU in after the update the machine appears unresponsive i.e. does not recognise the CPU. I have since reinstalled my old CPU and the machine works fine. Can anyone advise or lend assistance regarding CPU upgrade it would be much appreciate?