Orchids Have Dried Up

My orchids suddenly dried up. I can't figure out if they had too much water or not enough.

Too much or not enough water can cause any plant to dry up and die.  If your orchids are growing in a bark, peat moss and vermiculite or perlite mix (typical orchid mix) it is less likely you are over watering.  
If you still have the plant, carefully slide it out of the container.  Dry brown roots usually indicate a lack of water.  Slimy discolored roots can result from over watering or root rot disease.  Diagnosing this problem might help you be more successful with future gardening endeavors.  For best results grow orchids in a bright location and keep the potting mix moist.  I like to group my orchids and other houseplants together to increase the humidity around the plants.  This helps tropical plants survive the low humidity found in most homes.

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