Hello and HELP!

[candywhitevdub]

Hello everyone! I have been browsing these boards for a while and finally joined due to dire circumstances!

I started getting into plants when my brother picked up bonsai when I lived in Maine. I have since moved to Texas and bought a baby brassia verrucosa at a garden on a recent trip to Costa Rica. It has been in a pot of orchid specific medium here for about 4 months and was doing great until recently. This IS my first orchid and I feel it might have been a bit too much of a first project for me.

Attached are two pictures-
1. The leaf coming off the bulb was very green and healthy until recently and the roots were very white. This has obviously turned brown and limp and I have no idea why.
2. This shows the brown roots (firm and retain their shape) and the wrinkly bulb.

I have no idea if this is too much/not enough water, too much/not enough light, or temperature. I have been looking around online and am afraid that by the time find out whats going on it will be too late (if it isn't too late already).

So please let me know what I'm doing wrong and the best way to fix it! I'd love to see this little guy up and running!