Audio line -in : doesn't seem to be responding

Hi
My audio line-in port doesnt seem to be working any more.
Does anyone have any advice to help me trouble shoot this issue.
Ive already tried third party recording apps and a new set of mic-headphones but still nothing appears to be coming through.....it worked fine previously and was used often.
It may be an emac hardware issue or a system issue where i updated to Tiger a few months ago.
But perhaps it's something else !?
thanks for your time.
d

1. The type of headset im using is manufactured and ubiquitous for use with any pc or laptop
see for example :
http://ooscare.com/products/141_H261N-2%20Binaural%20Headset%20wbpic1.jpg
or
http://www.techfresh.net/wp-content/uploads/2007/11/plantronics-mono-headset-for -internet.jpg
or
http://thevoipgirl.com/wp-content/uploads/2006/08/headset.jpg
which are close to the ones i use. I know they're the cheap end but they are very common - Don't they just get their voltage from the mac itself ??
Also
2. Mine worked fine until recently - which means i was able to speak into the mic and hear it in software and adjust the audio input level in the O.S. sound prefs and now can no longer do this because when i have line-in selected as my source it's not showing any reciept signal in the display level indicator.
The simple fact that i was previously for several years able to operate one of these mic head-sets suggests that the issue must lie elsewhere and is has not been about the headset amp level as you suggested- My concern is that it is something to do with the OS Tiger which i recently updated to .....simply because it's the only major change i have in the recent past - i can't think what else it could be or what trouble shooting procedures to follow on this type of problem....
d

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