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OK, let me check some of my info to see what the fix is.

I know I have seen this before and the fix was too easy to remember... lol!

Don't give up yet. Even though the main menu only shows those settings, there is much more you can do. Let me dig around a bit. I have seen similar problems that were fairly easy to fix.

What...

I think it may be your linux settings then. I am not near any linux boxes right now , but check the menus for the settings. Sounds like the refresh rate or resolution is off.

Is it OK during boot up before linux loads?

Could be the linux settings for your display.