Since there are individual jacks for playback and recording, you now know where the faults could be. It will either be the computer's recording input port, the headphone's recording jack or a setting in the operating system. It looks like you have determined the jack on the headphones are functional, so that leaves the port on the computer and the software. It is still useful to visually inspect the recording jack on your headphones for any wear. There should be 2 rings that go around the circumference of the plug. They may not be making full contact inside of this computer's recording port.
Regardless, this is the accepted troubleshooting on the topic. If this doesn't resolve the issue, my suggestion is that the port has failed on the computer. Resolving Microphone and Line-in Problems (Windows 7)
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Re: Laptop microphone noises
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