ka hot sad diri oi...
1. test d mic first, try using another mic / headset, try testing ur soundcard if la prob
2. test ym... try chatting sa lain users sa ym... / reinstall ym
3. sauna sa amo office dili pwede magamit ang cam ug mic, probably gi limit ni sa server / software na ila security, never tried to ask...
4. try other softs that uses mic para call
5. last resort ISP... or dump ur computer...
FYI: wala ugok diri... were just trying to help... let us not limit ourselves into 1 solution... this will teach d newbies/juniors here how to troubleshoot