usually when i turn on the pc the idle temp of my cpu is 45-49 degrees celsius not comfortably hot for an idle state, but when I restart the pc the idle temp becomes lower 31-35 degrees, its weird. .
I have a xfx 8200 mobo and amd 5000+ cpu.
I usually restart the pc as soon as it is enable to restart after i turned it on, if I didn't restart the 45-49 idle temp will maintain until I restart it again. The 45-49 idle temp will increase as I open more heavy applications.
Make sure you don't get the thermal paste on the pins of the CPU or in the socket. most pastes have a metal compound in them and it could short out your CPU/mobo.
And remember a CPU is a ZIF socket. that stands for Zero Insertion Force. If you have to push it in you are doing something wrong. you might have to tap it just a little to make sure it is seated but DO NOT PUSH.
I don't know your level of expertise so i am just making broad suggestions so do not be offended.