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Question posted by tahiree241 on September 3rd, 2013

On Optiplex 780, At Start It Up, Lights 2 3 & 4 Keep On Blinking & No Display,

I have optiplex 780, On stsrt up the diagonistic lights 2,3 and 4 keep on blinking and no display comes on the monitor. According to Dell 780 manuals, a possible USB error may have occured and re connecting all cables should solve the problem. I have tried this solution many times but the problem remains there. What may be wrong ?? Please tell.

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Related Dell Precision 530 Manual Pages

Service Manual - Page 10

... tabs; Hold a component such as a microprocessor chip by its edges, not by its pins. Some cables have a connector with care. Do not touch the components or contacts on the cable itself. In addition, Dell recommends that you connect a cable, make sure both connectors are disconnecting this type of these safety guidelines when appropriate: • When...

Service Manual - Page 26

...power light on the system board. Otherwise, damage to -RAM light Telephony connector Network and Port 2 USB ...dell.com | support.dell.com S y s t e m B o a r d L a b e l s (continued) Connector or Component SCSI SPKR STANDBY_LED STR_LED TAPI/MODEM USB_NIC VRM_0 VRM_1 Label LVD SCSI connector System board speaker Standby power light Suspend-to your computer or unpredictable results may occur...

Service Manual - Page 43

...securing tabs (5) power supply release button Replacing the Power Supply 1 Slide the power supply cables through the hole into the chassis. 2 Insert the power supply securing tab into the ...the chassis (see the following figure). 8 Slide the power supply cables out of the computer. Ensure that all five securing tabs are connected to their slots on the chassis. 6 While pressing the power supply...

Service Manual - Page 63

... drive. NOTICE: To avoid possible damage, you can use the interface cable provided with pin 1 on both the drive and system board connectors. NOTE: To locate system board drive connectors, see "SCSI Device Installation Guidelines." • For a drive that comes with its own controller card, connect the drive interface cable to the controller card. •...

Service Manual - Page 70

... of the drive. 70 See "Attaching Cables for a Hard Drive." • Connect a DC power cable to the drive. See the documentation that accompanied the drive and controller card to verify that has its own controller card, install the controller card in an expansion slot. www.dell.com | support.dell.com Installing a Hard Drive 8 If you...

Service Manual - Page 71

.... NOTE: To locate system board drive connectors, see "SCSI Device Installation Guidelines." • For a drive that comes with the new drive. 10 Connect the interface cable(s) to the system board or a controller card, depending on the interface cable for a Hard Drive." For more information, see "System Board Components." For more information, see "EIDE Device...

Service Manual - Page 72

... cooling vents. 12 If the drive bay was previously empty, remove the corresponding insert from the front panel. 72 Fold cables out of the way to provide airflow for a Hard Drive drive interface cable DC power cable primary EIDE system board connector LVD SCSI system board connector 11 Ensure that all cables are firmly connected.

Service Manual - Page 74

...on the interface cable is the slave device (drive 1). When two EIDE drives are connected to a single EIDE interface cable and are configured for information on setting devices to the Cable Select jumper ... ATA/33 speeds. 74 www.dell.com | support.dell.com EIDE Device Installation Guidelines Jumper Settings All EIDE drives should be configured for the Cable Select jumper position, which assigns ...

Service Manual - Page 75

... installed in your computer. If you will support hard drives only. Cables purchased elsewhere are using the SCSI connector on the system board and a SCSI controller card installed in your computer, you are not guaranteed to work with Dell computers. Do not connect CD or DVD drives, tape drives, DAT drives, and so...

Service Manual - Page 85

CAUTION: Some network adapters automatically start the computer when they are connected to unplug your computer from its connector on the system board (see "System Board ... you lower the card toward its electrical outlet before installing any expansion cards and verify that the standby power light on the system board has turned off. If the expansion card is full-length, insert the end of...

Service Manual - Page 87

...light, see "System Board Components." 1 Turn off . To locate this procedure, see "Raising the Expansion Card Retention Arm"). 3 If necessary, disconnect any cables connected... to their electrical outlets, and wait 10 to 20 seconds, lay the computer on its connector. 5 If you need a filler bracket, contact Dell...message to be displayed at the next computer start-up: ALERT! ...

Service Manual - Page 107

.... Be sure that you are not guaranteed to cool before you receive a computer message, the diagnostic lights indicate an error, and the computer does not start. NOTICE: Dell recommends that the processor has had sufficient time to work with Dell computers. CAUTION: The processor can get very hot during normal operation. Then install the VRM...

Microprocessor Replacement - Page 8

... and discard the original heat sink(s) and securing clips. If the VRMs do not match, you may not start. If the processors do not match, the diagnostic lights will indicate an error. • If installing a Dell™ processor upgrade kit for either single or dual processors, remove and discard the original VRM(s). Then install...

Setup and Quick Reference Guide - Page 19

... Dell Documents. blinking green. The monitor is blank The computer is located in the video controller User's Guide. Problem? Or try the Dell Precision ResourceCD Or try the Dell Support Site I need a driver for See "Using the Dell See the Dell Precision my graphics card, Precision™ ResourceCD" on the and the power light is reduced power, or "sleep," Dell Precision...

Setup and Quick Reference Guide - Page 21

... start to work , periodically touch an unpainted metal surface on the computer to 20 seconds. 2 If you perform this procedure, see the following steps in the documentation that the standby power light ... the card-slot openings at the back of the cover to locate the standby power light. In addition, Dell recommends that you are going to remove or install a part, reset a forgotten password...

Setup and Quick Reference Guide - Page 31

...Guide. Blinks green several N/A times and then turns off A configuration error exists. Check the diagnostic lights to...Dell for technical assistance. Solid green and a N/A beep code during POST The monitor or the graphics card may Check the diagnostic lights to see if be faulty. Also, check the diagnostic lights to see if the specific problem is in the User's Guide. Blinking...

Setup and Quick Reference Guide - Page 32

www.dell.com | support.dell.com Diagnostic Lights When you turn on your computer with a single beep that signifies the start of normal operation. These lights communicate problems encountered before and during POST only, not during normal operation. If the computer fails to help you match the pattern on your computer, it performs a series of lights located...

Setup and Quick Reference Guide - Page 33

... following table lists the codes for the diagnostic lights that computer. the front-panel power light is connected to its electrical outlet. Computer is on . computer. failure. Possible system board failure. Contact Dell for technical assistance. Ensure that occur before the computer begins the POST. If the power light is off , ensure that the computer is still...

Setup and Quick Reference Guide - Page 36

... system board resource and/or hardware See "System Board Problems" and "Hardware failure. www.dell.com | support.dell.com D i a g n o s t i c L i g h t C o d e s D u r i n g P O S T (continued) Light Pattern A B C D Cause Action Possible USB failure. Conflicts" in the User's Guide. Disconnect all USB devices and cables, and restart the computer to retest. If the problem is necessary.

Setup and Quick Reference Guide - Page 37

... are listed alphabetically. Beep Codes If an error occurs during start -up that the computer was unable to read the data in the User's Guide. If a beep code is not listed in the User's Guide for suggestions on the monitor identifying the problem. If a system message is displayed, look it up under "System Messages" in...