how do i open the bootin ac2?

Yes. You'd have found it by now if you had done a Googe searc for yourself.

You'd have also found a few forums where failure of the boot lid switch has been discussed.

Took me all of 60 seconds to find these:

http://www.c2club.co.uk/archive/index.php/t-17832.html?s=2d98da397c0eff831ffd4e7288417987

http://forums.moneysavingexpert.com/showthread.php?t=4362293

Find a manual

XXX
January 2016