Red VGA IS OPEN WHEN I CONNECTED NEW SCREEN ASUS Z170-A

Yesterday i bought a new screen lg 29UM69G-B. i connected my screen while it was already opened with my old screen but i couldnt see anything.i did a restart and then the vga led on motherboard opened. My screen is well connected and i dont have any other problem. i tried to check the problem in bios by pressing del but i couldnt go in. Ps. when i connect my old screen vga led is closing after a restart. My previous screen was 19' is this the problem? what should i do ?

Specs:
i7-6700K
ASUS Z170-A
AMD SAPHIRE 7970
Ax1200w
Kingston HyperX Fury 8GB DDR4 2133Mhz
Reply to santez1818
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More about red vga open connected screen asus z170
  1. check if the 7970 is deeply and tighlty fixed in its slot

    how do you connect the monitor to your graphics card? Adapter used? HDMI, DVI, VGA, DisplayPort?
    Reply to helpstar
  2. helpstar said:
    check if the 7970 is deeply and tighlty fixed in its slot

    how do you connect the monitor to your graphics card? Adapter used? HDMI, DVI, VGA, DisplayPort?


    Already checked and i have changed the slot also.I use HDMI. My previous monitor was with dvi.When i connect both monitors (old and new) vga led is clossing and i can see bios only with my old monitor
    Reply to santez1818
  3. try another HDMI cable or a display port cable
    Reply to helpstar
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