I have a hp vs 17e lcd flat screen monitor, that when attached to my computer displays?

a message change setting to'1280x1024 60HZ'. I do not know how to do this! plus the monitor blinks on and off, making it impossible to operate the computer, or see the screen to make any adjustments.
Update: it has been fixed, thank all of you for the help.aaron answer is the one i used.
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