Hi,
As you do not say which ''flex ribbon cables'' you are asking about, here is a link to the service manual for your laptop.
If you scroll to section 3-4 it gives an exploded view of all the parts in the laptop. Once you have identified the particular cable that you are interested in, its' identity should allow you to find where it is connected to in the service manual and from there it should tell you the necessary pre-requisites and then the procedure to remove /replace the cable and the associated component that it is connected to.
http://www.hp.com/ctg/Manual/c00700959.pdf
Hopefully this is of some help.