Google-related sites not working on three browsers
I've been having an issue with Google-related sites and my MacBook for about a week now, and I'm not sure what the problem is.
Maybe 80% of the time my browser won't go to Google sites. I can't get to G-mail, Google.com, even youtube.com comes up empty a lot. A lot of the time it just loads and loads and nothing happens until it times out. Some of the time, I just immediately get a message saying it was an invalid address, blah blah blah.
If I type something into the google search bar on my browser or try to go to google.com, it doesn't work. If I go to G-mail from my bookmarks or physically type in gmail.com, it doesn't work.
And it's happening on all three of my browsers: Opera, Firefox and Safari. They're all doing the same thing.
I've tried quitting the application and re-opening and it doesn't work. SOMETIMES after I re-start the computer it will work for a little, then it always reverts to these odd habits.
I haven't changed anything with/on/in my computer recently. I'm running OS 10.4.11 on a MacBook that is coming up on four years old.
Any idea what is happening or how I can figure out what is wrong? Thanks.
MacBook, Mac OS X (10.4.7)