E7240 won't turn on (very explained post)

Question

Hi Everyone

First, sorry for my english, is not perfect, i'm from Chile.

i was trying to solve this problem for my own, searching or "googling" but i can't find any solution for this, i'll try to explain every detail, symptoms and solutions i've been tried.

I have a Dell Latitude E7240 (i7 4600, 16GB RAM, 256GB SSD mSata)

"Sometimes", when i press the power button it doesn't turn on.

Symptoms:
- Led power turns on then off > CAPS blink once and then power led turns on permanently, NO video image or fan noise, neither other led blinks.
That is with battery, because with charger connected nothing happens, nothing (No led, no blinks... nothing)
I need to remove several times the battery and randomly turns on completely (bios, OS, screen, everything!)
Other times, i turn on and if i have problem i leave it turned off and when i comeback to use it and... It's back again!.

When It's "alive" again, i can't press twice a key from the keyboard, and battery icon on Windows said "No Battery Attached" (Just for some minutes) after that is normal using without any problems.

When finally i can use normally so i can plugin the power cord.

Solutions i've been tried:
- Diagnostics, Pass everything except the battery because is old. (50% wear level)
- Two Memories changed and tested the slots, swapping or using individually.
- Notebook is clean and restored almost every internal part (except Motherboard and Battery)
- Heatsink and cpu fan are new
- Speakers are new
- Coin Battery (that circular and tiny battery inside is new)
- Keyboard and Touchpad are new
- Internal Power connector is new
- Original charger is new
- Never dropped or physical damage.

I don't know if i need to try anything else, so i very thankful any answer to trying to solve this.
Any test or any suggestion, i'll do it and post the results.

Thanks for everything
Greeting

David

mihalopu · Answer

I have the same problem, with minor diferrences sometimes it stuck when its gone on sleep mode and does not wake up, and other timew behave exactly like yours,

it does not even show the DELL logo to boot, the only thing that starts it if i remove the RAM SoDIMM and put it in the second slot it works sometimes and then it stucks again i removeit and put it in the other slot and again it boots,

it is realy frustrating and i can either do anything i am thinking in buying another module of RAM but i am not sure it will solve the issue

Apostolis

Darevas · Answer

Hi mihalopu and thanks for your experience

I'm not solve this right now, some dell expert contact me doing some diagnostics, but one was buying a new battery and now I'm stuck there trying to get it.

For now the laptop is working fine, but if i remove the battery or leave it without use several days it's happen again.

So I'm trying hard to buy a new and original one, hope that works.

Thanks for read the post and hope you can solve the problem.

Greetings!

AdrianG001 · Answer

Why didn’t you try the battery and took the nuclear option first? It’s often caused by a battery issue - on my E6540, my machine didn’t boot the first time and I either had to wait or press the power button twice to get a boot. When I ran it without the battery, that completely resolved the issue. The battery is more notorious for creating boot problems.

Darevas · Answer

Hi AdrianG001

thanks for read my post..

When the problem is "active" ... removing and put on the battery sometimes...(trying to boot)
if i remove the battery and connect the charger, it's definitely don't power on... no led, no blinks... nothing, almost dead.
That is my main reason to believe... the battery is not the problem, hope to be wrong.

Thanks for your comments
Greetings

Misterke · Answer

@Darevas​ , did you ever resolve your problem?  I'm having a similar behavior.  The PC works fine for long periods (days, weeks) using sleep mode in between the on states, but if it has to cold boot, it can end up in a state where it flashes the Caps Lock led once, then the HDD led once and then nothing anymore.  If I then press the power button again, the fan goes to maximum and after a couple of seconds the system turns off.  Trying to get into the BIOS doesn't work, same behavior as above.  Then pressing the power button again, restarts the cycle.  And then sometimes ... after a dozen of startup attempts, it might get to showing the Dell logo on the screen and then works fine for days again - until updates or something else might force a cold boot. So ... sounds very similar to your problem and hence I would be very interested to know whether you found a solution ...

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E7240 won't turn on (very explained post)

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