u have to press down THREE tabs at the same time, instead of one. look at your ps2, put the ps2 the normal way u would put it, with the controller port facing you. then look at the disk reader. on the top left there's a tab, on the bottom right there's one, and the other one i believe is somewhere on the right. i dont remember it that well, since there's been a while after i tempered with a V12, and maybe there's just two tabs.
its always a good idea to take the case open and look at the lid, see where it "presses"
matrix infinity: on and off 6 times
external speakers /w leading wire: done
memory card LED (activity + connectivity): done
controller status LED change + vibration LED: done
color-change lighting in v12: done
rgb to vga for monitors: FAILED due to not enough material
portable/internal LCD: sadly failed, as ps1 screen doesnt fit. planning same mod with intec screen
external harddisk for v12: CANCELED due to v12 breakdown
window for ps2 dvd-drive mod: in progress