It might not be the wifi card. If you have damaged ribbon cables underneath the left shoulder button, you may need repairs. I recently helped a friend with the same issue, and by messing around underneath the left button, I got the bottom screen to turn on. The top screen....I don't know. But if you get the bottom screen to work, I suggest not trying to do the same thing to get the top screen to work... *sweatdrop* (I ended up breaking it more after trying to get the top screen to work. I suggest being extremely careful. X'D)