To reach 2400MHz you will need to significantly increase different voltages. Dram Voltage will need to up two or three notches above the vendors setting. So if 1.60 then 1.672 VCCSA will need to increase too - you will have to spend some time working out what works best for your system.
But there is no certainty that your CPU is able to handle that frequency at all.
To help us help you - please provide as much information about your system and the problem as possible.