10.6.4 Update causes DHCP Problem

Question

With 10.6.4, after putting the iMac to sleep with the power button and then re-awakening it, intermittently causes OS X DHCP to fail and OS X falls back to a self assigned IP. Rebooting OS X restores DHCP functionality. This did not happen prior to 10.6.4.
Network:
Shared internet connection provided by Windows XP Professional with the iMAC connected to a second ethernet adapter on the XP machine that is configured with firewall off.
Hardware:
Model Name: iMac
Model Identifier: iMac11,1
Processor Name: Intel Core i7
Processor Speed: 2.8 GHz
Number Of Processors: 1
Total Number Of Cores: 4
L2 Cache (per core): 256 KB
L3 Cache: 8 MB
Memory: 8 GB
Processor Interconnect Speed: 4.8 GT/s
Boot ROM Version: IM111.0034.B02
SMC Version (system): 1.54f36

Answer 1

Ah ha! I noticed my Time Machine backup drive, a NewrTech Guardian Maximus FW 800 drive, didn't show up in Disk Utility when booted off the Snow Lep DVD. My boot volume checked out as error-free.
Simply shutting down and resetting the FW chain regained me the Desktop and the use of my two FW 800 devices. Phew!