Fan ticking under light load and makes pulsating noise under full load

Actually, the device is OK, the screen is okay for my needs, the speakers are great, and it's fast too.
Were it not for the fans. The ticking in pace and tone like an old clock. In the first few days after start-up, I have wondered time and again whether I in the room an alarm clock or a wristwatch have herrumliegen somewhere until I finally realized that the noise from the fan comes. When I ran the laptop then again a few days later at full capacity, he has then begun. It sounds like a little early New Year fireworks, what's going on in the device. Ca once per second it sounds exactly the same as would one of these Pfeifer ignited directly inside. Of course, a bit quieter, but loud enough that you could ignore it under any circumstances.
I looked around online and there are several threads of users with the same problem. And what comes from Lenovo? Absolutely nothing. Absolute ignorance. Or up to a PR lady on lenovo.com ([...]) which is nice, but rather holds out to cause as anything. Lenovo Germany I got to hear, because their hardware check program has not found anything, it must be due to my installation and I should reinstall it please. Although the problem is also in the BIOS and there are thousands of users who have the problem under various OS / BIOS / Energy Manager and other versions.