Umm.. No most computers dont have anti Vib Screws and parts. Most just screw the HD right into the case..
Did you read my post, man?
Hard Drives come with anti vibration screws/grommets... Not the computer itself.
If you don't believe shaking a computer is a valid diagnosis in trying to determine a grounding issue you can talk to any technician and I bet you he'll say it is!