Ah.. Ok... That's a bit different.. No worries, I'm sure we can help you through it..
Depending on how much it's warped, it may be savable.. Place the board on your jointer so that the high middle is on the bed (smiling). Keep the pressure on one end and keep making passes until the side sits flat on the jointer bed. From there, you can go to the planer.
The bad thing with a "warped" board is that if the board is too warped, by the time you get it flat, it may be too thin to use.
If the board has a lot of warp to it, it's best to get a different board. If the board is only "warped" a small amount then, the method above should work just fine.