Bought a used Multicom P17SM, having strange problems

Hi, so I bought a used Multicom P17SM (Clevo PS17SM is the original I think) and I'm having quite strange problems. So at first laptop had problems with overheating, I took it apart, cleaned it and changed the thermal paste. I tested the GPU on Unigine Heaven and temperatures dropped from 90+ celsius to about 70-80 celsius. As laptop was with Windows 7, I installed Windows 10 and did more testing and some interesting problems occured.

• The touchpad driver is causing strange lag. The usage isn't getting any higher with it, but the keyboard has this really long delay and sometimes it seems that it just stops working and some programs they fell like they froze but they aren't frozen, I don't even know how to explain. But when I end the process of the driver in the Task Manager, everything goes back to normal;
• The GPU temperature sensor doesn't work properly, it doesn't show it's temperature until the GPU gets some workload. Same was on Windows 7;
• The CPU fan seems to be misbehaving, SpeedFan shows that the CPU fan is at 50k+ rpm but I can't hear it at all and when I do a Prime95 test the GPU fan spins up for some reason? And I think that might be the reason why the CPU still overheats a bit, because the temperatures while doing the test go up to about 85-91 celsius;

I tried updating the BIOS and EC, but the problems didn't go away. I'm thinking it might be still the BIOS, because Multicom provides only 1.03.05 BIOS I think and as I looked Clevo has 1.03.11 BIOS version for their version of this laptop but I'm not sure if it will work on this laptop, so I didn't try updating it to that.

Any suggestions?

 

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Well, at the moment, I tried reapplying the thermal paste and it didn't really help. But I did some reading and it seems that it's normal for those components (i7-4700MQ and GTX 780M) to hit such temperatures and I'm using one of those budget thermal pastes (CoolerMaster IC1 Value) so it doesn't help either, and even then it doesn't seem to throttle in games. The GPU temperature sensor I guess doesn't bother me that much, as long as it shows up while GPU gets some workload. SpeedFan program doesn't seem to work well on this laptop, because HWInfo64 shows the CPU fan speed properly. So, I might keep the laptop actually and later on, buy better thermal paste and some thermal pads because some of them are worn off, get an SSD and I think it will be great.

Solved the touchpad driver problem with just updating the driver, because before I was using the one that Windows Update provided.