3COM Switch Problem

[kk123]

i've try my to check the coz but cannot manage to find out, if any1 face same kind of problem b4 N has settle it pls guide me.

here is the problem - my 3com 4400 bring down my gateway when ever i plug in the cable.

- As this 3com switch proform very well at other location

- i've log into the switch check the status and is stated "online"

- same as gateway status stated "connected"

- not error message

- unplug all other connected machine

- try other port also same

as i already replace with other switch, but i've to settle this matter, any1 have any idea pls guide me.

thanks in advance