Thanks for the reply.
I checked the case for loose screws and I couldn't find any, I wrapped all unused PSU cables in an anti static bag.
I don't know if those cover the first possibility but about the second one, the microphone used to work perfectly before this just happened yesterday, I also don't think I have the proper tools to test if my ground line is working.
Do you think laying the computer on the ground will do something? (All that cable management will be gone ?)
Thanks in advance!