3Com Switches 1100, 3300 Factory Reset

1) COM port, 9600/8/N/1/N
2) Web Or telnet to that address, hit [enter] once or twice to get the login prompt.
3) Default logins to try are admin/(no password) or security/security. One of those 2 should bring up the management menu.
4) reset factory defaults, type SYSTEM[enter] then type INITIALIZE[enter].

c3560 DHCP Snooping

Global Activate:

ip dhcp snooping vlan 1-4094
no ip dhcp snooping information option
ip dhcp snooping

Allow DHCP on Port:

ip dhcp snooping trust

Using Spanningtree can cause Problems with DHCP, use portfast on Userside Ports, but NEVER on Trunk!