My laptop doesn't even start now(after some repair work done by me - explained below).
I was hearing lot of noise from the fan and the laptop would turn off very often. So I decided to clean up the lint/dust near the heat sink. I disassembled the laptop, cleanup up the heat sink/fan, (forgot to cleanup/reapply thermal paste over CPU) and reassembled the laptop. Now the laptop is able to start off, with very less fan noise, but once the Win7 UI shows up - the fan would start up at high speed and the laptop turns off. It boots and works fine in Safe Mode. So I thought that the CPU is getting hot when the UI comes up and may be not reapplying thermal paste had something to do with it.
So I disassembled the laptop again, cleanup the existing thermal paste on the CPU with some Deodrant spray on an ear bud, applied 3 drops of Arctic Silver 5 thermal paste and reassembled everything back. Note that I just put 3 drops of the paste, but didn't spread it out even (if that is going to make any difference). After all this, now the laptop doesn't even turn on.
Can someone let me know what would have happened? Any steps to debug?