As bill said the switch has no ability to block ports, it would not even reject a bad IP configuration because it does not care about IP addresses. A switch is a very basic dumb device that takes an input from router and has the ability to extract the mac address out of the Ethernet data packet to know which port to send the data (it has a table that keeps track of which mac address is plugged into each port). The ONLY way the switch can be an issue is if the port is physically damaged. This can easily be troubleshoot by moving the cable of a non-working PC to a different port on the switch, if it now works the port was broken, if it does not work then the issue lies elsewhere.
Lets back up and tell us what your problem is specifically, and what networking equipment you have, and if you have done any troubleshooitng