Imac doesn't recognize external monitor but was working

i had my HP monitor (HP 2011x) connected to my imac for about three months and when i went to move my monitors and imac to clean my desk, my imac no longer recognizes the monitor.  all i did was shift the monitors to the left w/out unplugging any cables. 
i've seen multiple threads about the same issue where the external monitor is no longer recognized and the majority of no solutions.
has anyone come up with a solution to this? 
i restarted in safe mode to try and connect - no joy
i cleared the pram - no joy
any ideas?
thank you.

Eric Root wrote:
Send Apple feedback. They won't answer, but at least will know there is a problem. If enough people send feedback, it may get the problem solved sooner.
Feedback
thanks man ... i might just do that.  it is just aggravating b/c this problem seems to have been around for a long time (based on all the support forums threads started about it).
i went to the apple store this afternoon and verified my thunderbolt to hdmi was working and sure enough it was.  i talked to two staff members there and they were equally as clueless why the external monitor is not being recognized via the cable.

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