Hope you don't mind the interjection folks
Furax88, is it possible that the fan is still running and that you cannot hear it, I ask as fans cannot always be heard to be running and it is only when the temps get a little warm the MBs thermal sensor detects it and the fan is given a boost which can be heard.
Try removing the AC adapter, the battery and the Ram, pressing down the main power button for 30 seconds or so, connect only the AC adapter and turn on the notebook, let us know if the behaviour of the notebook changes, any error beeps for example.
To help with removing the Ram please use the notebook service guide here this is one of the better notebook designs as when the service door is removed to remove the Ram you will also be able to check that the CPU plug is securely attached, how clean the fan is and if the fan is still working when you turn on the power to test, I have to say this, please do not reach inside the notebook while the power is connected to the notebook.