I'm about to install my new system. I heard connect the grounding strap to the computer case, but if so should I plug in the power or unplug the power? Is there any other good materials except for the computer case? I remember someone said connect it on a lamp also works.
If your using a grounding strap, you don't leave the unit plugged in. Your just going to clip it on any part of the case that's metal really.
I've been doing computers for years and have never owned a strap. You don't need one as long at you keep contact with something metal (rest your elbow on the case or something), and leave it plugged in with the PSU switch off.