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Question posted by acflalinksh on April 15th, 2014

Dell T7400 Wont Boot 2 3 Lights

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Answer #1: Posted by RaviCatDell on April 24th, 2014 4:17 PM

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RaviCatDell

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Hi acflalinksh,

I'm a part of Dell Social Media Team. Kindly refer to "Diagnostic Lights" page 105, in the User's Guide to help you understand the error code.

There could be two main reasons for failure as listed below:

Before POST - A possible system board failure has occurred

During POST - A possible floppy or hard drive failure has occurred

User's Guide: http://dell.to/1tIfSpA

Hope that helps.

Dell-Ravi C
#IWorkforDell
Follow me on Twitter: @RaviCAtDell
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Related Dell Precision T7400 Manual Pages

Quick Reference Guide - Page 3

Contents Finding Information 5 Setting Up Your Computer 9 Changing Between Tower and Desktop Orientations 9 Installing Your Computer in an Enclosure . . . . . 10 Transferring Information ... and DVDs 24 Troubleshooting Tools 24 Power Lights 24 Diagnostic Lights 26 Beep Codes 30 System Messages 31 Hardware Troubleshooter 32 Dell Diagnostics 33 Troubleshooting 37 Index 53 Contents 3

Quick Reference Guide - Page 19

..., or a SATA hard drive in your User's Guide. Instead, perform an operating system shutdown. 9 Dell badge You can install the plate in your User's Guide. 13 network link light The network link light is on the computer. For more information, see "Controls and Lights" in the center of the four 5.25-inch drive bays...

Quick Reference Guide - Page 26

... . the computer is in the Product Information Guide. NOTE: After the computer completes POST, all four lights turn off before booting to help troubleshoot a problem, your computer has four lights labeled 1, 2, 3, and 4 on the front panel (see "Contacting Dell" in your User's Guide). 26 Quick Reference Guide A possible BIOS failure has occurred; A possible processor...

Quick Reference Guide - Page 27

... computer. • If the problem persists, contact Dell (see "Contacting Dell" in your User's Guide). Light Pattern Problem Description Suggested Resolution Memory modules are detected,... (see "Memory" in your User's Guide). • If the problem persists, contact Dell (see "Contacting Dell" in your User's Guide). If the computer starts normally, continue to install additional memory modules...

Quick Reference Guide - Page 28

System board failure Contact Dell (see "Contacting Dell" in your User's Guide). Light Pattern Problem Description Suggested Resolution No memory • If two or more memory modules are modules are using is supported by your computer (see "Memory" in your User's Guide). • If the problem persists, contact Dell (see "Contacting Dell" in your User's Guide...

Quick Reference Guide - Page 29

... Setup" in your User's Guide) to ensure the boot sequence is correct for the devices installed on your computer. • If the problem persists, contact Dell (see "Cards" in your User's Guide). 2 ... card) and restarting the computer (see "Contacting Dell" in your User's Guide). Light Pattern Problem Description A possible expansion card failure has occurred. Another failure has occurred.

Quick Reference Guide - Page 31

...'s Guide). Real time clock failure. • Replace the battery (see "Replacing the Battery" or "Contacting Dell" in your User's Guide for the same error (see "Contacting Dell" in your User's Guide). The computer failed to complete the boot routine three consecutive times for assistance). System Messages NOTE: If the message you received is...

Quick Reference Guide - Page 32

... or partition. • If the floppy drive is your boot device, ensure that the cables are connected and that a bootable floppy ... P O T E N T I A L H A R D D R I L A B L E - Hardware Troubleshooter If a device is correct (see "Contacting Dell" in your User's Guide for a loose cable connection. Windows XP: 1 Click Start→ Help and Support. 2 Type hardware troubleshooter in your User's Guide...

Quick Reference Guide - Page 34

... keys or press the appropriate number on the keyboard to highlight Boot to Utility Partition, and then press . Starting the Dell Diagnostics From the Drivers and Utilities Disc 1 Turn on your computer... (see the Microsoft Windows desktop, and then shut down any time a message appears stating that no diagnostics utility partition has been found, run (see "Dell Diagnostics Main Menu" on the...

Quick Reference Guide - Page 35

...takes 10 to wait until the Boot Device Menu appears. and down your part. Dell Diagnostics Main Menu The following tests can be run (see the Microsoft Windows desktop, and then shut down -...quickly. Run Express Test first to select the test you see "Dell Diagnostics Main Menu" on your computer and try again. 6 At the Boot Device Menu, use the up- To avoid possible keyboard failure,...

Quick Reference Guide - Page 42

.... • Shut down the computer (see "Contacting Dell" in the Product Information Guide. ENSURE THAT THE POWER... Device Manager. Connect a properly working keyboard to the computer. Contact Dell (see "Turning Off Your Computer" in your User's Guide), reconnect...PROBLEMS WITH AN IEEE 1394 DEVICE NOT PROVIDED BY DELL - Keyboard Problems CAUTION: Before you begin any of the...

Quick Reference Guide - Page 50

...Reference Guide CHECK THE MONITOR POWER LIGHT - • If the power light is lit or blinking, the monitor has power. • If the power light is off, firmly press the ... monitor is turned on. • If the power light is not necessary when installing additional graphics cards; Ensure that... T T H E E L E C T R I G H T S - See "Diagnostic Lights" on the keyboard or move the mouse to support...

Quick Reference Guide - Page 53

... headphone, 19 IEEE 1394, 19, 21 keyboard, 22 line-out, 21 mouse, 21 network adapter, 22 parallel, 21 serial, 22 sound, 21 USB, 19, 22 D Dell Diagnostics, 33 Dell support site, 7 Desktop System Software, 7 diagnostic lights, 26 diagnostics beep codes, 30 Dell Diagnostics, 33 lights, 19, 26 display.

Quick Reference Guide - Page 54

... problems, 40 Express Service Code, 6 F Files and Settings Transfer Wizard (Windows XP), 13 H hard drive activity light, 19 problems, 38 hardware beep codes, 30 conflicts, 32 Dell Diagnostics, 33 Hardware Troubleshooter, 32 headphone connector, 19 Help and Support Center, 8 help file Windows Help and Support Center, 8 54 Index I IEEE 1394 connectors, 19...

Quick Reference Guide - Page 55

..., 19 line conditioners, 16 problems, 46 protection devices, 16 surge protectors, 16 UPS, 16 power light conditions, 46 printer connecting, 13 problems, 47 setting up, 13 problems battery, 37 beep codes, 30...RW drive, 38 computer crashes, 42-44 computer stops responding, 42-43 conflicts, 32 Dell Diagnostics, 33 diagnostic lights, 26 drives, 37 e-mail, 39 error messages, 40 general, 42 hard drive, 38...

User's Guide - Page 7

... Tools 105 Diagnostic Lights 105 Diagnostic Light Codes Before POST 105 Diagnostic Light Codes During POST 108 Power Lights 113 Beep Codes 115 Error Messages 116 Dell Diagnostics 123 When to Use the Dell Diagnostics 123 Starting the Dell Diagnostics From Your Hard Drive 124 Starting the Dell Diagnostics From the Drivers and Utilities Media 124 Dell Diagnostics Main...

User's Guide - Page 32

...-drive bays starts embedded system setup (during start-up only) starts the Boot Device menu (during start-up only) launches the utility partition (if installed) during start-up runs onboard diagnostics Front panel: push button Front panel: green light-blinking green in sleep state; solid green for power-on page 100) 32...

User's Guide - Page 36

... implementation, see the ASF User's Guide and the ASF Administrator's Guide, which are available on the Dell Support website at support.dell.com. 36 Advanced Features Boot: Failure to Boot to verify system presence. Temperature: Generic Critical Temperature Problem The computer temperature is out of limits. Cooling Device: Generic Critical Fan Failure The fan...

User's Guide - Page 111

Troubleshooting Tools 111 Light Pattern Problem Description No memory modules are detected. Suggested Resolution 1 Reseat the memory modules to the operating system. 6 Run the Dell Diagnostics (see "Dell Diagnostics" on page 123). 7 If the memory module passes, shut down the computer (see "Memory" on page 139), remove the memory module, and then repeat ...

User's Guide - Page 124

... 124. On the next start the menu and press to wait until you see the Microsoft® Windows® desktop. NOTE: The next steps change the boot sequence for one time only. Starting the Dell Diagnostics From the Drivers and Utilities Media 1 Insert the Drivers and Utilities media. 2 Shut down your Drivers and...