My laptop RS232 port not working

I am having a HP make laptop. I usually use this laptop to communicate with a Delta Tau (USA) make motion controller for our industrial automation projects. But recently while working all of a sudden my laptop RS232 communication problem stopped working. Now it is not at all communicating. However the controller is OK. What must be the problem & how to repair my laptop port.

I am using PMAC PCI situated outside in a seperate box. Actually I had already tried on USB to Serial converter. It is not worked with my laptop for PMAC, however it works well with an Industrial PC with PMAC, however both working on same operating system i.e. Windows XP.
my email ID is [email protected] Presently I am online for next 30min. If you feel free then we can have some chat regarding this topic.
Message Edited by Shirish on 03-14-2009 07:36 AM

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