dead roots possibly from mold

[tasha]

Most of the roots on my cattleya are dead, subsequently i think the plant is dehydrated. I took apart the media and it had some white fuzz on it so I'm suspecting mold. Do i need to cut all of the white roots away or just let them die? also I guess i will have to get a fungicide. This is sad, because i just bought this orchid 3 months ago from an orchid show. the other orchid counterparts are thriving budding new pseudo bulbs but i noticed on this plant that one of the leaves was wilting a few weeks ago. I just watered it today, so the green parts look like the only remaining viable roots left, it had a lot of roots! the fading green parts means its dying right?

thanks a bunch

tasha