I have a few Vertex 2 drives...What I would do first is unplug all drives and usb devices that you do not need to get into your bios.
Clear/reset your bios, plug in the Vertex 2 and see if it shows back up in your bios, if not try hot plugging the drive a few times.(remove the power cable from the drive while power is on and replace the power cable) to the drive
The red led should not come on...not a good sign
If you can see the drive in the bios, I would update the drives firmware using the ocz bootable tools disk