laptop heatsink

Hey, I'm replacing the heatsink in this laptop, but for some reason when I removed the old one, the contact points for thermal paste were all different colors and the CPU one looked like a weird texture. Take a look in the picture Anyone know why this is? Do laptops do something special with...

Hi everyone, I own an ASUS TUF FX505GE gaming laptop. Recently I opened my laptop panel to re-paste the thermal paste and found that my screws were stripped. I don't know the screw size. please help me ASAP. ( I don't know if its m2 x 3 mm size or m2.5 x 3mm size). Also, how do I screw them back...

Laptop is super clean inside. I've also changed the fan, thinking it's the fan problem. But even after changing the fan, laptop just shuts down, while doing little multitasking. And yes, thermal paste is correctly applied, be sure for this. When in use, fan just start to run at it's maximum...