Is my Motherboard DOA?

Upgrade to an existing system, replace the Motherboard (ECS 755-A2 K8HT1600) CPU (Athlon 64 3000+) new memory. The hard drive is only 4 months old. Plan was to backup, install new hardware, come up, reformat the hard drive and a new install of Win XP PRO. PC does not come up, no beep codes, no POST, no BIOS, no evidence that the hard drive spins up, but the fans run, including the CPU fan. Thoughts? Thanks!