How do i re-format my imac? ?

Question

i want to erase all my files, and downloaded programs from my mac. i once did this before but i forgot how. its like you press some button when its booting up and then you just click something, but i dont know what. please help, and do i need teh CDs to do it ? PLEASE HELP! thanks [:

Answer 1

Insert your system install disc.

Reboot then press and hold C.

Select Erase and install.

Yes, you need your system install DVD.

You cannot erase the HD if you booted off it (as the previous poster suggested).