Anyway to sound proof or lower the noise of a case from outside??

[LewLewB]

Hi guys, basically I have a desktop pc (CM elite 342 case) sitting on my desk, and i find it quite noisy when i'm doing some work.
So I would like to ask if there is anything i can do to lower the noise?
I dont think i can use those soundproof pad which sticks inside the case, the interior basically have no space for that..

 

[LewLewB]

dynamat the inside. dynamat is wat they use to deaden the sound of car doors/panels.
i put inside my antec 900 and it was great. stopped a lot of the vibrations.

looked up their website looks good... but i dont know if it fits inside, on of my side panel basically is like 0.2cm from touching the top of my cpu fan .. and the cables and stuffs are touching the case as well as its just soooo small