For $29/mo, we provide access to advanced level technicians who will answer your questions on any Macbook board related matter to the best of their knowledge promptly & walk you through how to solve your problem so you can deliver a working board to your customer.
Check if the piece of tape is still on the airport connector that prevents the metal sponge from shorting out the pins. Could also be a bad RAM slot. If that does not solve it I call it trash.