Non-responsive iMac

Argh, what is it with my luck with iMacs?? It's me, the one that's on her fifth iMac, and was thanking the Mac gods for a computer that finally doesn't make weird noises...and now it's doing something very weird. A couple days ago, I noticed that it would freeze somewhat on web searches. I was doing car searches, and sometimes the page would just sit there, and not let me do anything. Apps I would try to open wouldn't open, and the icon in the dock wouldn't bounce. Basically a frozen machine other than the cursor. Then it would release itself after a minute and be fine. This happened two or three times is all, and I chalked it up to something on that website.
Just now, I was looking at a site, when it did it again. Only it didn't go back. I tried pressing the alt/control/esc and when I pressed quit, it wouldn't do anything. So I finally shut the thing down, and tried again. Same thing, no apps would open, nothing. I tried shutting down, unplugging, then starting up. Nothing. Then the third try, it seemed to be still having the problem, so I (on a whim) shut my wireless mouse off and turned it back on. Voila, it started working. I think it was a coincidence, and it just started working a little bit after turning back on. I may be wrong, but it seems odd that the mouse had anything to do with it.
What should I do...besides back up everything now. I forgot how to back up to my external HD already, but I can do a search for that.
Wow, this was freaky...

> Is there some reason nobody answered my question?
Welcome to the Apple Discussions dedicated to the iMac Intels.
1. You appear to be in the wrong forum, iMac Intels will not run Mac OS X 10.3 Panther.
2. It is a User to User forum. If no one comes along who feels confident that they can assist you with your problem, no one will post.
3. It is a very scattered post, and I for one am not sure exactly what the problem really is. The more precise and concise you can describe the issue and any attempts that you have made personally to solve the issue is helpful. As well as which model of Mac you have, how much RAM, any important periferals, as well as the most recent OS update you have installed.
4. If you have an iMac g5 the forum is here.

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== This happened ==
Every time Firefox opened
== three months ago and getting worse with every upgrade you send!!!!!!!!!!!!!!!!!!!!!!!

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From Here
Unresponsive iPad
http://support.apple.com/kb/TS3281

Non-responsive iMac

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