HU-474...Here is another suggestion that you could use instead of James's method, or with James's method. What James has said is a perfectly good way to try to revive the plant, this is simply another way that I have used successfully in the past. First--If you have already taken the plant out of the pot and repotted it, fine. now, instead of just putting it on the shelf with other plants, get a plastic bread bag, and put a hand full or two of wet Sphagnum moss, or orchid bark mix in the bottom of the bag, slide the pot into the bag, and seal it up. Some bread bags come with holes punched in them, others don't, put several holes or cut slits into the top of the bag, and hang the bag in a bright but not sunny, or hot location. I would hang mine under my orchid bench in the greenhouse. keep the material in the bottom of the bag wet, but don't let water puddle in the bag. Humidity is critical to reviving a dehydrated orchid plant, and the bag method increases the humidity all around the plant, without it sitting in water. Second, if the plant is not repotted, take it out of the pot, and trim off any dead roots. Make sure the roots are dead...dry, shriveled and brittle. do not cut down into live root tissue. cutting into live tissue means those live cut ends of the roots will come in contact with liquid water for long periods of time, and that invites rot. Put a couple of handfulls of wet Sphagnum or bark mix into the bread/plastic bag, and seal it up. Make a few air holes in the top of the bag, and hang it in a bright, but not sunny place, as above, and keep the material in the bag wet.

What you want to do is increase the airborne humidity around the plant, and keep it elevated constantly, not letting it dry out, but not keeping it soaked either. The bread bag is just an easy way to do that. Orchids absorb moisture from the air through their leaves and roots, but they don't want to be kept "wet" all the time. I have revived many orchid plants with this method. It works particularly well with rootless shriveled Cattleya back bulbs when I had bulbs from a particularly nice plant that I wanted as many divisions of as possible--Just bag em' up and hang them under the bench, check for moisture occasionally, and wait them out. A lot of pretty pathetic plants rewarded me with new life. Its usually a long wait, but you may win this plant. Good luck.

Bill