Early 2011 15inch MacBook Pro not displaying on external monitor

I have an early 2011 15 inch MacBook Pro and I tried to connect it to a Samsung U28D590D 4k display.  My computer is recognizing it as a monitor and saying that the output resolution is 2560x1440, which is what I expected considering my graphics card is an Intel HD Graphics 3000 512 MB and my chipset is an AMD Radeon HD 6490M with 256VRAM.  I just don't know why its not displaying on the monitor.  Any help will be very appreciated.

i did manage to get a little step further and get my mac to ask about resolutions but it still won't appear on the monitor

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