Fans going crazy fast...

Up until today, the fans would rev up on certain sites, no big deal...BUT, just a few hours ago, they started screaming. Closed everything and rebooted and they keep revving up and slowing down a little (not all the way) and then rev up again...and NOTHING is open? I did not update anything, the only thing i did today was download a fewe songs from iTunes and thats when it started. anybody else having this issue?

Assuming nothing is actually broken in the hardware:
If you reboot, and start no programs, and the fan cranks up - open Activity Monitor, set it to display All Processes, and sort by CPU usage. When the system is idle, with no programs doing anything, nothing should be using more than 1-2% CPU, and even that only sporadically. So, you look for something that's using enough CPU to get things hot enough to speed up the fan.
The solution, after that, depends on what you've found. In many cases, it's a stuck job in a printer queue.
If, on the other hand, Activity Monitor shows the CPU to be 90+% idle, and the fan is still cranked up, it suggests something's amiss with the hardware.

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