I'd expect much more people with same problem then...
Can you post all your components if you didn't return it yet? In case it is some weird incompatibility with PSU or something.
Mine are:
Case: Cooler Master Cosmos S, full tower
PSU: Corsair CMPSU-850TX
CPU: i7 930, batch 3001A135
CPU cooling: Cooler Master V8
RAM: GSkill F3-12800CL9T-6GBNQ, triple channel, 3x2Gb
DVDRW: Samsung S243D/BEBE 24x SATA
HDD: 150 Gb velociraptor (SATA2), 1Tb WD black (SATA3, 64Mb cache), 1Tb WD black (SATA2, 32Mb cache)
OS: Win 7 Ultimate, 64 bit