Question about Dell Latitude E6400 Laptop

1 Answer

Dell E6400 won't boot up (most of the time)

I have a 4.5 year old E6400 which recently decided to stop booting up most of the time. This is what happens... 1. Press power on button 2. Drive spins up and drive light flashes 3. Nothing happens for about 5-10 seconds. Nothing appears on the screen. No BIOS screen or anything. 4. The fan starts whirring at top speed then the power light goes off. It gets complicated because sometimes: a. the fan doesn't whir b. the machine attempts several restarts on its own, i.e., after switching off it switches on again and goes through cycle 1 - 4. c. the machine eventually stops retrying and the numlock, capslock and shiftlock leds gor through a flashing sequence. The sequence is numlock flashes and caps lock and shiftlock stay on. According to the service manual this means a possible CPU fault. So, when this first happened, it seemed to disappear after a short while. The computer then functioned as normal and I used it for a couple of days. On the second instance, I couldn't turn the machine on for about 30 mins. During this time, I removed all the memory, the disk drive, battery, etc., and tried various combinations to get the machine to start. Nothing appeared to work. Maybe, the only thing that did work was removing all power for a time and letting something inside either cool down or reset. Eventually it did start up again, this time with a message that the time is not set. The BIOS settings appeared to be wiped. As a result of this I checked the voltage on the CMOS battery which was 2.99. I thought that this was a bit low sow I bought a new CMOS battery. Three days later, after fitting the battery, the machine started up after a couple of boot attempts. That didn't look great but I thought it would, maybe, be OK. The next day the machine started up OK. In the evening, the machine wouldn't start again. The new CMOS battery reads 3.29 volts so I assume it's ok. Since then I've re-seated the CPU, removed all power and left it overnight and, this morning it started again. At this point I ran a full diagnostic (f5) which showed no problems. After an attempted reboot, it won't start up again. So, what else can I try or should I give up on this? I assume that some component involved in start up has aged, is affected by heat because the machine starts up OK from time to time, getting less regular each time. Any pointer on what other start up components could be broken?

Posted by on


1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 20 achievements.


    An expert that got 10 achievements.


    An expert that got 5 achievements.

  • Dell Master
  • 32,281 Answers

Computer does not boot up
The problem maybe the RAM, it could be faulty or just needs reseating to make proper electrical contact.
Reseat the RAM and then boot up your laptop. If it still does not boot up then remove the RAM module/s and take them to your friendly computer repair shop and get them to test the RAM for you.
Just like you sometimes need a mechanic to repair your car, sometimes you do need a technician to diagnose and identify the fault or faults on your computer. Not only does a good service technican have the experience to deal with this type of problem, they also have the equipment that allows them to look at things the average computer user can't see, and he has a collection of replacement parts that can be used to quickly test individual components on your computer.

Posted on May 11, 2013


6 Suggested Answers

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of.(from cars to computers, handyman, and even drones)
click here to download the app (for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017

  • 7 Answers

SOURCE: won't post/boot

Check to see if you are getting any flashing num,scroll,or caps lock lights you can also if you want a definite answer go to (, select the system type and go through the troubleshooting steps.

**Oh by the way if you turn on your system and then it turns back off after less then 3 seconds, according to dell troubleshooting we would be looking at replacing the motherboard.

Posted on May 14, 2009

  • 2 Answers

SOURCE: Dell Inspiron 1000 Crashes Disk light stays on

Mine will just freeze up and get some dashed lines through the screen when this happens. I am wondering if the cooling fan is maybe not doing its job well enough and the processor chip is just getting too hot?

Posted on Jun 05, 2009

  • 137 Answers

SOURCE: will not boot

click here to find the details.

you may also like to click here

Posted on Oct 02, 2009

  • 262 Answers

SOURCE: I have a Dell Inspiron E1705 that seizes up.

sounds like your hard drive is about to take a dump or cpu is not cooling good and she is over heating mite get a can of air and blow your fan area out mite be stopped up by some dust try this and see if it helps....

Posted on Dec 10, 2009

  • 2 Answers

SOURCE: I've got a Dell Latitude D520 which is failing to boot

If it's not even posting then this is more than likely a mobo issue. Had the same problem with one and a motherboard replacement fixed it.

Posted on Apr 03, 2010

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

I recently got a dell latitude e 6400 laptop windows xp how do I upgrad o change to windows 7 pro service pack 1 32bit

please use win 7 cd and try to change os .

insert a boot cd (win7)
make 1st boot device cd rom
press any key
follow the steps .

Sep 17, 2013 | Dell Latitude E6400 Laptop

2 Answers

I forgot my password for my Dell Latitude E6400, My Laptop loads the Dell Screen then it goes to a white screen that says "This Computer System #******* is protected by a Password Authentication...

You can remove or change the Window's User or administrator's password. You need access to a computer with Internet access to download the Hiren's Boot CD and burn it onto a CD. Then insert this CD into the laptop/computer and boot up the laptop/computer with the Hiren's CD and follow the instructions. There are very useful utilities CD and it a Linux boot CD which contains quite a lot of Utility programs including a password removal program. Click on one of these links to download HIREN'S BOOTCD :-

Jan 10, 2013 | Computers & Internet

1 Answer

XPS 410 won't boot but CPU fan spins

A loud CPU fan will also equate with overheating and imminent failure. Can you reliably access your system BIOS? Can you run a memory test there? If so your CPU is functional (and your memory which is also subject to overheating and BSOD under XP. If those are good your prime suspect is your HDD. If you can afford it, now would be a good time to replace your system.

Jan 09, 2013 | Dell XPS Computers & Internet

1 Answer

Dell inspiron530 won't boot and beeps four times stops and beeps again

The Beeps are a beep code 4 means you have a ram read/write failure. Or a possible motherboard failure in that case you will need to contact Dell or replace it yourself.

Oct 01, 2012 | Dell Inspiron 530s Desktop Computer

1 Answer

How to boot y inspiron 1545 if it won't boot past

If it getting stopped near Dell logo.

If can be the problem related to your Ram or Hard Disk.

Try pressing F8 key after you pressed the Start button

Jun 07, 2012 | Dell Computers & Internet

1 Answer

Fn key not working on Dell Latitude E6400

one quick simple test to see if the key works is hold the Fn key and press the power button on a clod boot from power off state. If the PSA diagnostics start the Fn button is functional, and we'll need to troubleshoot other issues.
If the PSA diagnostics do not start, then reseat the keyboard (It has a slot connector into the palmrest) and see if that resolves. If still no change, replace 1st the keyboard, and if that doesn't resolve the palmrest.

Jul 26, 2011 | Dell Latitude E6400 Notebook

1 Answer

I'm not sure when it started, because my 17 year old son was the last person to use the computer. I have a 4-year old Dell PC and have been running Norton Go Back just about the whole time. Since late...

my advice is to uninstal Go back as sometimes it stops the boot process, but you may have a faulty drive, so first try starting in safe mode (Pressing F8 on boot up), select safe mode and if it boots into windows you know it's not a hardware problem, but a software one.

Sep 02, 2008 | Computers & Internet

Not finding what you are looking for?
Dell Latitude E6400 Laptop Logo

87 people viewed this question

Ask a Question

Usually answered in minutes!

Top Dell Computers & Internet Experts

Les Dickinson
Les Dickinson

Level 3 Expert

18402 Answers

Doctor PC
Doctor PC

Level 3 Expert

7733 Answers

mukhtar21 shaikh
mukhtar21 shaikh

Level 3 Expert

2017 Answers

Are you a Dell Computer and Internet Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides