AC is not working

I bought my AC on May 6 2007 and it corssed the warranty period also. Now there is some problem in my AC after the 2 mins delay time am getting that flickering sound (where AC always use to indicate the owner whether its switched on or not) but unfortunately sound alone is getting but still my AC is not switched on. Can any one of your engineer help me out in this regard
Thanks in Advance

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