I opened the case and I noticed the folowing:
1) The PSU fan does not spin (although I am not quite sure it should)
2) All the case fans and the CPU fans spin, with the exception of the exhaust fan
3) There is a red light coming from a LED on the motherboard: CPU_LED
4) The case lights turn on, but they turn off shortly again like the rest
Hope this might help
Thank you in advance for any advice you can give me.