Verify the monitor cable is not loose by disconnecting the cable from the back of the monitor and reconnect the cable. It's also a good idea to ...SkiptoMainContentHomeHelpHardwareHelpMonitorHelpHowtofix"noinputsignal"errormessageUpdated:06/30/2020byComputerHopeIfyourcomputermonitorisdisplayingtheerrormessage"NoInputSignal,"trythetroubleshootingoptionsinthesectionsbelow.TipThispageisfortroubleshootinga"noinputsignal"onadesktopcomputer.Ifyouareusingalaptop,see:Howtoconnectanexternaldisplaytomylaptop.NoteToconnecttoaTV,see:HowtodisplayacomputerimageonaTVorprojector.ComputernottransmittingasignalMakesurethecomputerhaspower.Ifthecomputeristurnedoff,itcannottransmitasignalandcausesthe"noinputsignal"message.MonitornotconnectedproperlyVerifythemonitorcableisconnectedcorrectlyandsecurelyonthebackofthemonitorandthebackofthecomputer.ThemonitorcableconnectstothebackofyourcomputerusingeitheraVGA,DVI,HDMI,orDisplayPortconnector.ThepicturesbelowareexamplesoftheVGA,DVI,HDMI,andDisplayPortconnectorsonavideocard.Verifythemonitorcableisnotloosebydisconnectingthecablefromthebackofthemonitorandreconnectthecable.It'salsoagoodideatorockthecablebackandforthtomakesureit'snotloose.TipWhendisconnectingthecable,makesurenoneofthecable'spinsarebentbyexaminingtheendofthecable.Ifanyofthecable'spinsarebentorbroken,thecablemaybedefectiveandshouldbereplaced.NoteSomeoldermonitorsmayhavecablesthatcannotbedisconnectedfromthebackofthemonitor.Next,disconnectthemonitorcablefromthebackofthecomputerandreconnectthecable.Whenconnectingthecabletothecomputer,ensurethecableconnectionistight.WithaVGAorDVIstyleconnector,liketheonesshownabove,screwscanbetightenedandholdtheconnectorinplace.TipSomecomputersmayhaveanonboardvideoandavideocard.Whenworkingwiththistypeofcomputer,you'llhavetwodifferentconnectionsforyourmonitoronthebackofyourcomputer.IfyouseemorethanoneVGA,DVI,HDMI,orDisplayPortconnectorandthemonitorisnotworking,trytheotherconnector.IncorrectinputselectedNewermonitorsarecapableofconnectingtoacomputerusingaV