If you are sure that the case speaker is working, no beeps would point to either a CPU error or a motherboard error. Since you have replaced the CPU, that leaves the motherboard. This assumes that the power supply is functional. You can test it by swapping the power supply with a working power supply. You can also check the power supply with a multimeter or a power supply tester.
The power supply listed (Corsair CX Series) are well known for being problematic.
AMI Beep Codeshttp://www.bioscentral.com/beepcodes/amibeep.htm