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Home-Built PC displays on motherboard but not on GPU, even though GPU is working

Strangely when the GPU is clipped on to the motherboard and the HDMI cable is in the GPU socket (not the mobo socket) the monitor screen will either; not go past BIOS, or flashscreen or even into bios - but every time it could be randomly either one - and will remain there till I turn the computer off.
Even if I simply change the HDMI cable to the mobo socket the exact same thing happens.

However if I disconnect the GPU and connect the HDMI into the mobo socket the computer works normally - accept low-usage games are very glitchy with slow frame rates of course probably caused by the absence of a GPU.

To test it it was a fault in the GPU I connected it to another pc and it worked fine therefore clarifying that the GPU is not the cause of the problem.

Compatibility - This is a guess that they might not be compatible but I had an employee from the store I bought the equipment from make sure they were.

System Specs:
Motherboard - asus B85MK
PSU - WideTech 650TM
HDD - Seagate 1T
SDD - Kingston 120GB
Optical Drive - Samsung writemaster
CPU - Intel core i5-4460 LGA1150
GPU - Sapphire R7 260x 2GB PCIE
RAM - 8GB Team DDR3 DIMM
WiFi Card - asus PCE-N15 card(this may somehow be the problem because the PC worked the first time through the BIOS and installed Windows 8.1 as well as all drives with recommended restarts then switched off computer to install this card underneath the GPU!!!. after that i tired to turn the computer back on but could'nt get onto windows unless i disconnected gpu and plugged into mobo)
OS - Windows 8.1

I APPRECIATE YOUR TIME IN TRYING TO FIGURE OUT THIS PROBLEM - THANKYOU
4 answers Last reply Best Answer
More about home built displays motherboard gpu gpu working
  1. 1 iv never herd of the motherboard cant find much of it in the net also i look for buying it and i find nothing only thing is the user manual and india all i can say is this motherboard
    http://www.amazon.co.uk/MSI-Z87-G45-GAMING-Motherboard-USB3-0-LGA1150/dp/B00D12OBEU/ref=sr_1_5?ie=UTF8&qid=1405948504&sr=8-5&keywords=LGA1150+motherboard

    From experience when stuff like that happens it could be the motherboard but its just a suggestion or return it and get a replacement, it could also be bottlenecked but try replace it with something that is more popular
  2. ludastar said:
    1 iv never herd of the motherboard cant find much of it in the net also i look for buying it and i find nothing only thing is the user manual and india all i can say is this motherboard
    http://www.amazon.co.uk/MSI-Z87-G45-GAMING-Motherboard-USB3-0-LGA1150/dp/B00D12OBEU/ref=sr_1_5?ie=UTF8&qid=1405948504&sr=8-5&keywords=LGA1150+motherboard

    From experience when stuff like that happens it could be the motherboard but its just a suggestion or return it and get a replacement, it could also be bottlenecked but try replace it with something that is more popular


    Sorry put wrong info up
    it is an ASUS B85M-G,s1150/4DDR/4USB3.0 mATX mobo
  3. Well this does look like the service manual:
    http://dlcdnet.asus.com/pub/ASUS/mb/LGA1150/B85M-G/E8146_B85M-G.pdf

    The motherboard could easily be faulty.
  4. Best answer
    Whoops, problem sovled

    I plugged in VGA cable and it worked. I think it might be that the GPU is not compatible with that monitor when using HDMI - Maybe it is too many 'p' x 'p'
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