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I have a rather old mac pro, and the mplayerx I believe does not use the GPU and probably is not implemented to use multiple threads, and it cannot play 1080p without a video/sound sync problem (the internal player works fine - not sure if it is more efficient or uses the GPUs I have installed).
I use a 40 HD monitor as my main display, but I would definitely notice the difference the difference in having a 4K monitor (when I run the iPhone simulator - the resolution is high enough that it will not fit on the screen). A 40 inch screen is 600+% larger than that 15 inch laptop. So to keep the real resolution (pixel size) the same for a 40" monitor you would require 5K.
In addition I use multiple monitors (4), and displayport monitors have the ability to be chained on the same connection -- which would allow me to get a laptop (later this year when Skylake is out) and have 3 x 40" monitors attached using this standard.
You can try following codes one by one until you get access to service menu:
Mute + 1 + 8 + 2 + Power
Display/Info + Menu + Mute + Power
Display/Info + P.STD + Mute + Power
P.STD + Help + Sleep + Power
P.STD + Menu + Sleep + Power
Sleep + P.STD + Mute + Power
You can press Channel Up/Down buttons to navigate between available options. To change their values, press Volume Up/Down buttons.
Be careful about certain options - you can change things that could do nasty things to your TV.