Snow Leopard disk

[Night--Mare]

i want to restore my imac so it "like new." because its running slow. last month when i restored my mac mini it got 99% but never finished. had to take it to the apple store so they can restore it. i dont want to do that with my imac because it's big.

MY QUESTION IS, is there a way to tell if your snow leopard disk work and theres no problems with it be4 i go throughout the restore process.

 

[Darth.Titan]

The Snow Leopard install disc should go through a "Verifying Media" process before starting the install. Just don't skip it.

 

[Night--Mare]

The Snow Leopard install disc should go through a "Verifying Media" process before starting the install. Just don't skip it.

i'm pretty sure it deletes you OS X partition first and then checks.
can some1 help me out?