Tri boot or even quad boot will only work if you did my dual boot

Hey wanna put linux on there too or any other os?So first go into your mac part of your pc and once again go into disk utility and create a new partition then after you did that shut down your computer and insert your linux disk and start your computer up and then it'll either boot into the linux disk or you go to your boot menu and select the dvd and then install and select your new partition and then just do everything else and let it install then your done.

--Seamus IW