easiest thing to do is to make one switch the main...
5406# Config
5406(config)# Spanning-tree priority 0
5406(config)# end
5406# write memory
By default HP switches are all set to Spanning Tree Priority of 8.
Another thing to do is to go into the menu at the CLI and set the MAC Age Time from the default 300 to 900 seconds. This will help sensitive servers from disappearing from the arp tables during longer periods of inactivity.
While in there, make sure you set the time server settings. Most Windows 2k3 servers are inherently a time server, and all you have to do is use SNTP Unicast to the IP address of say your Domain controller. Next make sure you have the time zone set properly. This is in minutes, not hours. Eastern USA is -300. Making sure the time is set properly will always ensure that your logs will show the proper time, keeping the guess work out of it.
Good Luck,
Mark