Question PC keeps on rebooting after upgrading CPU

Nov 27, 2020
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So um, I replaced my intel e4600 with a q8400, and now it restarts by itself when I turn the pc on. This only happens on the q8400, but everything is working fine when I use the e4600

Should I buy another processor? or is this possible to be fixed?

I've tried resetting CMOS using the jumper method thingy, reseatting RAM, dusting off the cpu slot. Other methods does'nt seem to work either.