Upgraded old dual core cpu with quad core cup and now the pic won't boot up?

The motherboard and the new cup both have the lga775 socket so I don't understand what the problem is. The "new" cpu is an Intel core 2 extreme qx6700. Can anyone help me understand what the issue could be? Because clearly the socket isn't an issue and I thought that was pretty much the determining factor. Sorry for making anyone think hard since its older hardware. I don't have the budget for anything new right now so I'm trying to make do. The pc is a Lenovo ideacenter k300.

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