problem with resolution?

[Awesomesause]

I had recently done some modifications to my computer an extra hard drive and a graphics card I tried to run KSP and every time a text box with the title error said

"Couldn't switch to requested monitor resolution  Details: Switching to resolution 1280x720 failed, trying lower one All resolution switches have failed Screen could not switch resolution (1280x720 fs=0 hs=60)"

before i added the modifications KSP did not have this problem now even if i remove the things i added this still comes up. I tried changing the resolution on both KSP and my monitor but nothing seems to work. if anyone knows a solution to this please tell me.

[JPLRepo]

You say extra graphics card? Do you have more than one installed in your machine? Have you disabled all but one of them?
Also sounds like the resolution is not supported by your card/monitor. You could try resetting the settings file so that KSP will generate a new one with valid resolutions and back to default.
Try going into the KSP directory and renaming or deleting the settings.cfg file. When you first start KSP it will regenerate this file with the default/valid settings.