Images show up only as blue question marks

I just purchased a new Macbook Pro approximately one week ago, and concitering it's BRAND NEW I don't understand why I have this problem. On sites like www.deviantart.com and also www.weheartit.com images show up as blue question marks... I have downloaded both chrome and firefox to check if they were any different, but the same images wont load there either. I've read some about this, but no one seems to have any other advice than to "check preferences" and set it to "show images" or something, as far as i can see there is nothing wrong with the preferences. I have also downloaded and updated to the latest versions of both java and flash, but nothing seems to work. This is getting really frustrating, and I am desperate for help! I greatly appreciate ANY advice. Thanks in advance 🙂