I think I did something terrible to my Latitude 5501

Recently I noticed that the fan would spin fast once I plug in the charger, I downloaded a software that monitors CPU temperature and the I found out that the Max temperature the CPU reaches when laptop plugged in is 100 celsius.

The first thing I did was replacing the thermal paste and when I turned on to check the same problem persists.

I read online that the overheating might be caused from overheating VRMs, so what I did was that I looked for the VRMs on the motherboard and I thought that the rectangular grey components with codes on them are the VRMs(The ones showen on picture number 1 alongside the CPU chip)and I thought that because there is a cover connected to the heatsink that has thermal pads underneath making contact with these rectangular components.

I thought that adding another layer of thermal pads while solvent the overheating issue so I inserted new thermal pads over the existing ones and put the heat sink back and powerd on the laptop after connecting the battery again to the motherboard only to see a critical error message that reds “battery not installed” in BIOS diagnostic tool. since then I shut down the laptop and removed the extra thermal pads but the laptop still not detecting the battery.

I know it’s a very long story but I really need your help.