The reason I asked my first question was because I was afraid I would destroy my miner by changing the PLL.

I redused the PLL and the miner got a lot cooler, and I was able to do some more digging before it shutted down.

In the interface I noticed one of the fans had a really low RPM, and after dissasembling it, I noticed the fan did not work at all.
The fan on the PSU doesnt work either 

The provider of this miner told me it had been running for 2 months, but I have a feeling it has been used for a long time. Is there any way I can check for how many hours the miner has been running in total?

Hi,
I have tried to chat via Skype, but in 24 hours I still havent got any reply.
Im ny interface I can choose different values for PLL.
Is there other settings I can use to reduse the heat (underclock)

Hi,

I'm rather new to this.

Earlier I had my miner at a "company" who did everything for me, but after a bad year they decided to return the miner to me.

Here at my place the miner seems to get too hot, and it shuts down after a few minutes. The PLL is set to 750 - is it possible to reduce this to get a lower temperature?