Question about Dell Latitude E6400 Laptop

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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?

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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

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Posted on Jan 02, 2017

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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 (http://support.dell.com/support/topics/global.aspx/support/dsn/en/tree?c=us&l=en&s=gen&treeid=3D170450481B7790E040A68F5B2871BC), 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

anandsharad
  • 137 Answers

SOURCE: will not boot

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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

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