Did you install the no-codecs version of mint? If yes have you installed the codecs via the link on the splash screen? Otherwise have you un-installed anything or assuming you are running firefox, running any blocker addons, tried with a different profile, looked at about:plugins to see what is active?
[Edit] your original post and add [SOLVED] once your question is resolved.
“The people are my God” stressing the factor determining man’s destiny lies within man not in anything outside man, and thereby defining man as the dominator and remoulder of the world.