How to reset Dell monitor resolution

I have a new Mac hooked to Dell Monitor. I was playing with the resolution. I set a wrong value. before waiting any time, the monitor displays out of range and is locked. what do I need to do to reset the resolution?
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More about reset dell monitor resolution
  1. Use the manual to bring up the on screen display ...on the U2410, ya hold ya finger spot above the blue ON / OFF LED
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