I own an off-lease WIndows 10 i7 Dell Optiplex 980. I just bought a new Samsung 32 inch monitor which only has a display port and a HDMI input. Mu pc only had DisplayPort and DVI. I did not have a DisplayPort cable so I opted to simply update the video card which has worked well in the past.
So, I installed a new msi HD6450 card . I removed the Dell pci card which worked using a DisplayPort to DVI cable first. When I booted up using the new card and the new Samsung monitor, once Windows loaded the screen looked funny. I could not read anything so I rebooted using a simple power button push not a hard reboot. On reboot I see the Windows flag clearly and then all I see is a black screen. It is sending a signal but not anything I can see. Out of desperation, and after several reboots, I put the old card back in. This results in the same output.
I cannot remote into this computer as I have not turned on remote desktop connections.
I cannot get into safe mode because its too fast and that apparently is not an easy thing to do. I don't have my Windows 10 disk because it is a refurbished pc .
I have tried to revert back to my old monitor but this fails too.
Any ideas? Is my only option to create a Windows 10 boot disk to get into safe mode.