There are a couple of things you can checkout, hopefully one will resolve the issue. Are you up to it? do you have the correct tools and work area (ESD mat & strap) and lastly the skills to work with delicate parts? If you do read on.
At this point you need to know what kind of trauma you system encountered as that will help in fingering out what direction you will need to go. As an example did you drop or bang your system or did something spill into it or did you sit it onto a wet surface? Also has the system been serviced before or is the system used?
If you don't know you'll need to open the bottom plate to inspect things. Let us know what you discover and well guide you to the next steps.