|You don't need a BIOS update. |
Check BIOS settings, though. Make sure that Wake on LAN, Wake on KB/Mouse, and Wake on USB are all disabled.
Turbocharged 939 | Dual-core Opteron 185 @ 3.2GHz | 2x 8800GTS in SLI | 4GB PC3200 @ CL2 | A8N32-SLI Deluxe |1TB | PCI-E X-Fi Titanium Pro | Swan D1080MKII + Dayton 10" 125w sub | W7 Ultimate