Since around a week now, my second monitor has stopped being detected.
Here’s how my pc was when it happened :
Windows 10 ( upgraded last summer ( july) from windows 7 -> no issues until last week)
i5 4670K processor
8 Go ram
Z87 G45 motherboard
GTX 770 graphic card
700 W PSU
250 Go SSD
2 To HDD
Main monitor : Samsung SyncMaster S24B350, plugged by vga, with dvi adapter, to the 770
Second monitor : Panasonic TX-L19C20E, plugged by HDMI to the 770
I have access to another computer ( my brother’s) to check my hardware for failure, and his computer works fine. I’ll call his PC2, and mine PC1
At first, I suspected a hardware malfunction, so I made the following tests and changes :
I tried my GTX770 in PC2, and plugged my monitor 2, with my HDMI cable. This worked fine, I had something on both screens.
I also tried my motherboard + CPU + 770 on PC2. This also work.
I replaced my PSU. with a new one ( 650W)
I replaced my motherboard with a GigaByte H170-HD3
I replaced my CPU with an i5-6500
During all of this, I cleaned my case, replugged everything several times, HDD and SSD moved around.
I also did a clean install of windows 10, using the restauration tool in windows 10 ( not using a cd or flash drive)
I reinstalled my graphic drivers several times, using different versions ( this was one of the first thing I tried), and also trying it with DDU to remove everything.
I tried 2 different HDMI cables, that I confirmed worked anyway using PC2.
Right now, i’m using a GT640 from PC2, that worked fine on PC2, but I still have my problem on PC1, using this other card.
Monitor 1 is plugged to the 640 with a vga cable ( no adapter), and monitor 2 is plugged to the 640 with an HDMI cable.
During boot, only the monitor 1 display POST, and later windows 10 loading. At no point the second monitor display anything.
I tried booting by only plugging monitor 2 with the vga cable, and it displayed POST, and displayed windows 10 loading for a few second before stopping, and then receiving nothing at all. At this point I have to unplug monitor 2 and replug monitor 1 with VGA.
Can anyone think of anything else I can try?
Thank you very much for your time