radeon r9 285x not working after motherboard upgrade

May 27, 2018
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Hello everyone,
my situation is this, my old setup had some problems so i finally took the step and upgraded the general facilitys.
new motherboard, cpu and ram.
specs are:
gigabyte B360M DS3H motherboard
crucial 8gb ddr4 2400 ram
intel i5 8400 cpu

and i also reused my old gpu
a radeo r9 285x

after all the work im left at this impass:

i can boot up the pc ok and start windows 10 BUT i can only use a
monitor if i go over the cpu graphics. if i have my gpu active every one
of my 3 monitors stays black (pc seems to start normally. mouse and
keyboard light up and i can use capskey to switch lights.)

i guessed that it would be the missing drivers for my graphics card but
when i use the internal graphics i have to deconnect the gpu or its getting used automaticaly (even when i enable internal graphics in bios) so the computer doesnt recognize the gpu and thus the drivers
program doesnt say it finds hardware for drivers.

i tried every possible driver update i could think of, chipset, os, io driver etc. the only thing i couldnt do yet is update bios, cause when i tried the update utility of my bios doesnt recognize any usbdrives and doesnt let me search my internal harddrive. only lets me into a folder named efi that i cant see when i've booted to windows...

tldr:
gpu doesnt send signal to monitors after motherboard upgrade.
is it the missing gpu drivers or should atleast some signal come through the gpu even without drivers? if drivers are problem how can i
install them without signal to monitor, and i also have to disconnet gpu
to use cpu graphics?

hope someone can help me. big thanks in advance :3
 
May 27, 2018
3
0
10


i did use a windows 10 install boot stick to reinstall windows 10. in that process i deleted all the partiontions on the harddrive and created new partitions. then i installed windows 10 on that new partition. now that you mention it, what i did not do was completly format my harddrive beforehand.
do you think that could be the problem?
 

You would not need to completely format your harddrive beforehand if you deleted all the partitions, created new partitions and installed windows 10 on the new partition. Did you let the Windows 10 install boot stick do this automatically?
 
May 27, 2018
3
0
10
ok now i feel kinda dumb XD

apperently the pcie primary display switch was the solution, even though i did that before and it didnt do anything, this time it worked.
i got signal and the system found the graphics card. installed drivers normally and now it all seems to work fine.
thanks again for the help. much aprechiated ^^