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Hello my name is***** will be assisting you today. I will try my best to help you
Sir/Ma'am is this Dell OptiPlex 390/3010 PC also are you in front of the PC now?
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It seems like you are offline now,when you are back online could you please check on the back of the Dell PC whether it have a HDMI port or VGA port.i am sending the images of each with this so that you can identify it easily
I apologize for the delay in replying back to you.
Thank You for the details.Its looks like your PC have HDMI.
Pictures will help a lot to make sure.Sending pictures on this page wont cost any more.
Sir/Ma'am this is justanswer which is a paid tech support site. We do not have any tie up with dell but we can also help you fix the issue you are facing. We have been online for the past 10 years and we have A+ rating from Better Business Bureau which you can check using this link http://ww2.justanswer.com/about-justanswer Please let me know whether you want to continue with our tech support or not.If you do not want to continue let me know and i can request to close this question and refund.If you wish to continue send me the pictures and i can assist you better also see if this is the model of dell monitor you bought http://downloads.dell.com/Manuals/all-products/esuprt_display_projector/esuprt_Display/dell-u2414h_User's%20Guide_en-us.pdf