CPU upgrade

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?

Thanks,

Rodney
youngrodAsked:
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_3mp3ror_Commented:
Does it beep or do you see anything on the screen when you install this new cpu  ?
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☠ MASQ ☠Commented:
Pretty certain the Dell BIOS only supports the QX Quad CPU's - I'll try and find a reference for you.
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youngrodAuthor Commented:
The machine does not beep.
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youngrodAuthor Commented:
Does this mean that my replacement CPU is incompatible?
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☠ MASQ ☠Commented:
XPS 7xx Motherboard supported CPU's
E6600  2.4GHz dual core
E6700 2.66GHz dual core
Q6600 2.4GHz quad core
QX6700 2.66GHz quad core
QX6800 3.0GHz quad core
 
http://en.community.dell.com/forums/t/19243283.aspx 
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