what log are you getting when its connected ?
what type of phone are you connecting and have you tried to set the power to auto in teh cli config under the interface ?
This doc shows you how to manually alter the power for the i3000 might be worth a try #
https://www.cisco.com/c/en/us/td/docs/switches/lan/cisco_ie3000/software/release/12-2_50_se/configuration/guide/ie3000scg/swew.html#wp1092726Powering the PoE Port
Beginning in privileged EXEC mode:
Command
Purpose
Step 1
configure terminal
Enter global configuration mode.
Step 2
interface interface-id
Specify the port or the range of ports to be configured, and enter interface configuration mode.
Step 3
energywise level 0
or
energywise level 10
(Optional) Manually power off the port, or
Manually power on the port.
Step 4
end
Return to privileged EXEC mode.
Step 5
show energywise domain
show energywise children
Verify your entries.
Step 6
copy running-config startup-config
(Optional) Save your entries in the configuration file.
Note The power level that you set in Step 3 is the default power level when the switch restarts.
https://www.cisco.com/c/en/us/td/docs/switches/lan/cisco_ie3000/software/release/12-2_50_se/configuration/guide/ie3000scg/swew.html#wp1092726
