I'm selling my iMac G5 (isight), it having developed VRAM problems. To remove data, I understand that overwriting prevents data recovery and would be safest. Do I do this by starting it up in target mode and overwriting from another machine, then start up the iMac from the instal disk? As it's a bit final, I thought I better check? The G5 is still working but has the dreaded green wavy lines. Many thanks.
MacBook Pro 2 GHz CD,iMac G5 1.9 Ghz 1.5GB, iMac (Flat Panel) 800Mhz 768MB 60 GB, Mac OS X (10.5.2)