Don't worry, there are two ways that are equivalent to waving a magic wand to get the old webpage to suddenly reappear.
INTERNET ARCHIVE (aka "The Way Back Machine")
1) Pop the URL that you are trying to access into the search box that looks like this 2) Click on any of the dates that represent when the site was last archived
GOOGLE CACHED (best used when you get taken to the inactive link via a Google result)
Select the Cached link below the result and you'll be taken to the last time the page was archived
Go ahead and give it a try. You can use these tools to check out any website, not just ones that don't seem to exist anymore.
Go ahead and give it a try. You can use these tools to check out any website, not just ones that don't seem to exist anymore.