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My samsung monitor syncmaster 743nx is not turning on..plss help me...tnx

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How to troubleshoot a Samsung SyncMaster 743NX LCD \015\012Monitor?\015\012 My Samsung SyncMaster 743NX \015\012monitor turns on slowly. I mean,last week when I started up my pc,it \015\012took 5-10 mins before my monitor displayed anything. I know the pc is \015\012already turned on because I've already heard the Windows Vista start up \015\012tune play. The problem is now getting worse as it now takes 20-30 mins \015\012before my monitor displays anything. Please help.
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