204 Solving Problemsw w w . d e l l . c o m | s u p p o r t . d e l l . c o mBack Panel LightsWhen you turn on your computer, it performs a power-on self-test (POST),which is a series of self-diagnostic checks. A successful POST ends with asingle beep that signifies the start of normal operation. If the computer failsto emit the single beep or appears to stop responding during POST, a seriesof lights located at the rear of the computer can help you understand whichPOST test failed or why the computer stopped responding. These lightsindicate problems encountered during POST only, not during normaloperation.CAUTION: Before servicing any components inside your computer,see “CAUTION: Safety Instructions.”The light patterns described in the following table can help you determinewhat to do to resolve the problem. If a problem resolution requires you toopen the computer chassis, see “Finding Solutions” for procedures you needto complete prior to performing the suggested resolution. If the problempersists after you perform the suggested problem resolution(s), contact Dellfor further help.The following table lists the codes for the back panel diagnostic lights, givestheir probable causes, and offers suggested corrective actions. The lightpatterns are shown as they appear on the back of the desktop chassis(vertical position).Solid green power light withno beep code and no videoduing POSTThe monitor or thegraphics card may befaulty.See "Video and MonitorProblems" If the monitor isoperating properly and iscorrectly connected, see"Getting Help" forinstructions on obtainingtechnical assistance.Solid green power light andno beep code but thecomputer locks up duringPOSTAn integrated systemboard device may befaulty.See "Getting Help" forinstructions on obtainingtechnical assistance.
