Dell monitor saying "Cannot display this video mode"?

i just got a fat old monitor yesterday and it said it wasn't in freqency range so i got a new slim dell monitor today and when i turned it one it said cannot display this video mode i rebooted my computer pressed f8 and went into safe mode but it just brought me back to the cannot display video mode what do it... show more i just got a fat old monitor yesterday and it said it wasn't in freqency range so i got a new slim dell monitor today and when i turned it one it said cannot display this video mode i rebooted my computer pressed f8 and went into safe mode but it just brought me back to the cannot display video mode what do it have to do to fix it! (btw my tower is a dell that is 3 years old and just got repaired )
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