Won't boot up after cpu downgrade

Bluestonez

Commendable
Jul 30, 2016
3
0
1,510
My specs is
intel core 2 duo E4600 @ 2.40GHZ
4GB DDR2 PC5300 667Mhz dual channel
Intel® Desktop Board DG31GL
windows 7 home premium
160GB 5300RPM hard drive
R7 240 2GB GDDR3
500W PSU

i need to change my CPU for a while until i get a replacement for the CPU due to overheating, i'm replacing my CPU into an old pentium E2200, this my old CPU that i replace with Core 2 Duo and it still working, after i test it in other computer but when put it on my computer it doesn't boot up if you know this already please reply this.
your help is my appreciation.

P.S The core 2 duo has a bit a scratch at the top of the name.