Dual monitor stopped working after Mavericks installed

27-inch Mid 2010 iMac - upgraded to Mavericks, now LG monitor gives "no signal" error message. LG model is 27EA83, connection is via DisplayPort. It worked before (Lion) and also works with MBPro upgraded to Mavericks. The iMac recognizes the monitor but nothing shows up onscreen. Any ideas?

miss you steve

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