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2.2 GHz (Turbo Boost up to 3.4 GHz), 2.5 GHz (Turbo Boost up to 3.7 GHz), or 2.8 GHz (Turbo Boost up to 4.0 GHz) quad-core Intel Core i7 processor with 6 MB shared L3 cache.

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MacBook Pro 15" Retina Display Mid 2015 unresponsive

I am trying to connect my new mac by HDMI to my unresponsive MacBook Pro mide 2015 which I cant use the track pad

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First you can't use a HDMI connection between your two Mac's. You can use Target Disk mode to gain access to the second system if you can get it to respond.

From what it sounds like you need a different option here. Are you able to get any reaction from your system? See if you can get into diagnostics using the D startup key.

References:

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