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Help! All the interior air flow JUST STOPPED all of a sudden.

(2000 Chevrolet Malibu)
in Germantown, MD on July 03, 2012
Everything is working fine when I plug a little device used for music into the power port (the second cigarette lighter). It turns on but I don't have time to fuss with it. A minute later I notice it's turned off. I check my main cigarette lighter and it isn't working either. Then I realize that worst of all there is no air coming from any of my vents! I try turning the knob off and moving it 1 through 5, but no air is coming out at all. Not hot or cold.
When I press the button for A/C, the indicator lights up and I can hear the engine working a little harder the way it normally does when the A/C is turned on but still no air from the vents. The indicator lights for the buttons to switch from outside air to inside air also seems to light up. JUST NO AIR FLOW & CIGARETTE LIGHTERS DON'T WORK.

I figured it was just a fuse so I checked them all (except the larger, gray, square ones - I don't know how to check those) and they were all fine. There haven't been any symptoms that this system was having trouble, it just stopped working exactly as I described. And of course this happens when it's 100 degrees outside every day.

PLEASE HELP! I absolutely can NOT afford to just take it to just blindly take it to a shop It seems weird to me because I thought the cigarette lighters were different systems than the HVAC, but what do I know? I just pray it is an easy fix and not a major part replacement with a lot of labor involved.

Thank you!!!!
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