If the system doesn't boot up when you press the power button and you're sure everything is connected properly, then it MIGHT need a BIOS update. But if you get a processor that is listed on the CPU Support List with the first BIOS version and you get a RAM kit that's listed on the RAM support list, and your connect everything properly (read the motherboard user manual), it should boot up the first time and ask for an OS installation.
-Wolf sends