replaced I6000 lcd, brightness controls reversed + problems

The lcd on my laptop went dim and was not readable. So I bought a new screen from ebay and installed it following the directions found on this site. Once I powered it up, the brightness controls were reversed. When I try to brighten it goes dim and vice versa. This is causing problems with the Dell quickset power options. While plugged in, the screen would be at maximum brightness. But it is somewhat dim. When I turn the brightness all the way up, the computer thinks I turned brightness all the way down, the screen would go blank after a few minutes. I would have to reboot to be able to see anything Did I do something wrong when I installed the unit? All of the connections on the wiring harness only go one way.