[PROBLEM] Asrock H77 pro4-MVP - ASUS HD7870

Hello eveybody, I have a little problem,

I just bought this MOBO:

and this VGA:

my CPU is a Intel i5 3570 IVY BRIDGE (ivybridge supports PCIE3.0)

now the problem is that when I put my VGA in the PCI Express 3.0 x16 slot (PCIE2: x16 mode), my monitor says: NO Signal
When i put HD7870 in the other slot ( PCI Express 2.0 x16 slot (PCIE3: x4 mode) ) everything works fine...

Why I can't use the PCI3.0 x16?

PS: NOT a monitor/cable problem, tried with HDMI and DVI cable.
3 answers Last reply
More about problem asrock pro4 asus hd7870
  1. Hi, Sometimes it's related to socket bent pins. Not sure though if it's your case.
  2. How can i check if it's related to pins?

    if it's a pin related issue, I have to send back my mobo to producer, right?
  3. It depends. Sometimes they can be straightened. I would take the board outside the case and test again. If still the same, uninstall the CPU and use a magnifying glass or take a high resolution picture for inspecting the socket.
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