Don´t tear anything off!
I had problems with the keyboardribboncable when i installed my accelerator.
Just pull up the tabbed bit of the connector, stick the ribbon in and push the connector back down.
It didn´t worked for me the first time but when i tied again i moved the ribboncable as far left in the connector it could go then it worked.
So if it doesn´t work try to move the cable around in the connector before you take it apart