Screen Resolution change

Is there any OSX key combo I can use to change the screen resolution?
I changed the resolution up to try it - my monitor couldn't handle it. Waited for it to ask me to confirm, and then flip back, but it didn't. Restarted my computer, but it still seems to be kicking out the signal at the too-high resolution, which won't display.
I can't see the screen sufficiently clearly to navigate into System Preferences. Can anyone assist?

Hmm, that should have worked since that's the file which holds both your screen resolution and profile information. You may have accidentally chosen a refresh rate that your monitor can't handle.
Start up once again in Safe Mode. Go into the System Preferences and click the Displays icon. Click the "Detect Displays" button. Select any resolution you know will work. Make sure it's not the same as the current choice to force OS X to write the information back to disk.
Close the System Preferences and restart normally.

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