I bought a new mobo and CPU and the CPU (i7 7700k) will not post to the new mobo. It is a. Gigabyte z170mx-gaming 5. All I get is 5 long beeps after its turned on for about 15 seconds. After the beeps it will shut down and start back up. Do I have to get an older LGA1151 CPU to do a flash bios to update the mobo?.