HDMI Port not working on Lenovo G460 Win7-64bit

I've been trying to solve this for some months now.
I bought my lenovo G460 with nvidia M310 (with hdmi) this year and have not been able to get the hdmi port to work.
I have two lcd displays one in our lab and another one at home (LG 2361V-PF) which have hdmi connections in the back.
In the beginning I was able to get my notebook to work on the display in our office. However, now both displays (work+home) are not working.
I have tried to reinstall latest nvidia drivers as of 2010-11-02 (ver. 8.16.11.8990) from lenovo, completely restore Operating system and tried different hdmi cables.
I have even tried to use original drivers and also downgrade that to a lower version all with no luck.
I have even taken my LG LCD display to the LG After Service Warranty office and have found no issues wrong with the Monitor itself.
I am sure I have taken all the trouble-shooting methods into consideration so a simple question is...
Is the hdmi port defective?
I will take my laptop into the Lenovo After Care service center this week, but before then is there anyone who has had this issue and solved it? -->or is it just a hardware problem easily fixed with warranty replacement parts.
Thank you
Solved!
Go to Solution.

::Update:: ----------> Partially SOLVED
Lenovo After Service Center Report:
1. hdmi connection is fine
They said that it could be a software problem and that they would try to update the driver.
Partial Solution:
Use Lenovo Original Drivers, for some reason NVIDIA newest drivers conflict with hdmi port on Lenovo G460 .
I restored my laptop to factory condition and tested the hdmi connection and it worked for a few seconds ...
my lcd screen started to flicker and my laptop flickers now when hdmi is connected....(A sign that hdmi is not really broken)
Will update solution when i get it to work 100%

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