2002 Hyundai Santa Fe

Air Conditioning problem
2002 Hyundai Santa Fe 6 cyl Four Wheel Drive Automatic

Got in my car this morning and the A/C was working just fine. Went down town came home turned car off. About 3 hours later went to start my car and the A/C is no longer working. It made no sounds or smells. Its just not coming on at all. On none of the setting. Cold or hot neither is working. What could be causing this and what do I need to look for to find the problem?
August 2, 2010.

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