New mac user, IMac with thunderbolt dual screen no longer works

Hi, I have just started using a mac for work and was loving my new dual screen setup. it was functional for a day and now the second screen is black and saying I should check the signal cable. I have
     Tried other DVI cables that go from thunderbolt to screen
     tried 3 screens, one of them from a different brand
     I have updated firmware
     and restarted / shutdown/ disconnected device then reconnect about 10 times
     and pressed detect displays about 20 times (it seems to detect the screen, its just not sending it anything?)
     before the screen stopped I had to do a restart for the latest Itunes and mac updates
but to no response. please help my productivity is really reduced

Take a look at these links,
http://support.apple.com/kb/HT4744
http://support.apple.com/kb/TS3775

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