A few days ago I started noticing problems with OS X. For example, when I went to double-click something nothing would happen -- except for a pop-up for a menu of options. If I tried to type anything, nothing would appear. The keyboard was basically useless. So I'd reboot and it would go back to normal.
On Saturday it started happening again. This time the problem would return just a few minutes after rebooting. Eventually I had to leave for the day, and left the computer on. When I got home that night, I had quite the surprise..
In my Mail program there were now about 300 messages, and growing every minute. Most of the messages were "undeliverable" notifications. It looked like someone was ghosting my e-mail address to send out spam messages (my address was listed as the originator).
I didn't make the connection between the problems I had earlier with this e-mail problem because, Macs don't get viruses, right?
Then I called my service provider and they claimed that, from what they could tell, the spam messages were in fact coming from my computer.
Normally I used Little Snitch to guard against things like this but recently I turned it off -- only intending for a brief time -- and forgot to turn it back on. Did a program find a hole? What sort of program can do this? More importantly, how can I find it and get rid of it?
Hmm. Does sound like something nasty is happening. It may not be a virus though. Any chance that somebody would have had remote access to your system? E.g. Remote desktop, SSH, any other server running (e.g. Apache with a PHP hole)?
Are you behind a firewall device?
"Do the Right Thing. It will gratify some people and astound the rest." - Mark Twain
Since I updated the last Firmware I have had this problem: (and it just happened). Sometimes it's waking up from sleep (but not always), but my mouse will be dead and so will my keyboard. I unplug and then replug my mouse and it will work (plugged into my keyboard). But my keyboard will still be dead, until I replug it, then it will work again. Is that what is happening with your computer? It's friggin' frustrating.