The cpu is supported on your motherboard for bios 1105 and above. If you updated the bios prior to installing the cpu, it should work.
Did you purchase the cpu new or used?
It is new.
BIOS installed is 1107.
I updated BIOS with i5-4670. Then new CPU was installed but it doesnot work.
But the seller tested it in my presence. I saw it start on their MB.
One of the Intel support staff may have other suggestions.
This message was posted on behalf of Intel Corporation
Thank you for contacting Intel® technical support. I will be more than happy to help you.
I understand that you are having issues with an Intel® Core™ i5-4670 processor.
Please double check every connection that goes from the power supply to the motherboard to confirm if everything is properly attached. Also, check if the processor fan is running, and if you see any lights in the keyboard when you turn the computer on.