2950 switch problem

there is a problem with cisco 2950 switch. there is a upsfor this switch. when ups is working with batteryand then connecting to power outlet, the uplink port of switch doesn't power on.with re installing the patch cord cable in the port it is power on. also some of its ports shutting down with no reason and with reinstalling the patchcord cable it wil be go on. whats wrong ?

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