I guess you had it coming ....
NEVER try to force a CPU series on a mobo that doesn't officially support it, especially if you have an OEM pc.
I'm afraid that you have to either :
Get back to old CPU .
start a new build because your mobo -even worse- supports DDR2 memory only, so if you want to get benefit from your new CPU you'll have to get new mobo & ram.
Sorry my friend, but you're at dead end with that