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Dell Latitude e6420 doesn't boot, charger LED blinks 22 time

July 4, 2018 at 07:14:33
Specs: Windows 7 Professional, 2 GB
My dell latitude e6420 faced blue screen n said it is doing memory dump then shut down.

I power it on n it reached to the boot options,

- Start windows Normally
- Run a startup diagnostic (its the meaning, not the exact wording as I don't remeber it now)

As it recovered from blue screen, I chose 2nd option n laptop booted again n showed a blue screen error just within couple of seconds I pressed the power button.

Since then laptop is not booting. Power button LED goes of in 3secs n LEDs on the left upper corner of keyboard are,

- Storage LED is solid
- Charging LED blinks 22 times before all shut down
- Wifi LED is solid, even if I turn off the Wifi hard button

Went through lots of suggestions over the internet n Have done below so far,

- Cleaning connectors of HDD n RAMS n Wirless cards etc... n reseating one by one in various pattrons

- Removed CMOS for over suggested 10 minutes n cleared static charge as well

- Same behavior after each step

Please advise...

See More: Dell Latitude e6420 doesnt boot, charger LED blinks 22 time

July 4, 2018 at 07:43:06
According to Dell's blink code reference, you've got bad RAM. Try removing the DIMMs, cleaning the contacts, and reseating. If that doesn't work, seek replacement memory.

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July 4, 2018 at 07:45:44
like he said, he did already, so maby 1 or both ram modules are dead

i5-6600K[delid]@4.8GHz/4.4GHz@1.39v LLC=6 | 2x4GB Crucial-DDR4-2133CL15@14-14-14-30 1T 2800MHz@1.37v
MSI Armor RX 570 4GB@1395Mhz core@1.168v/1920MHz BiosModded

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July 4, 2018 at 08:08:32
Many thanks for the prompt response...

If u r advising about 2 RAM modules seated one under the other, I have already cleaned the connectors with eraser n seated, more than once. Position is still same

If its not RAM, please guide where does it locate?

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Related Solutions

July 4, 2018 at 08:22:48
It seems to be bad RAM. Did you change or upgrade it it lately? By clearing static charge, do you mean you unplugged the AC adapter, removed the battery, & then held the power button for at least 20 seconds? If not, try it. If you're able to boot, immediately run a memory diagnostic.

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July 4, 2018 at 08:49:56
RAMs Neither changed nor upgraded.

Yes, static charge cleared as you described.

I m unable to boot, screen remains blank n rest happens as in my original question.

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July 4, 2018 at 09:17:57
Well, if you've already done the cleaning and reseating, you're looking at replacing. Try booting the machine with the first DIMM. If it doesn't work, replace the first DIMM with the second DIMM. If you can't get the laptop to boot off of either DIMM, you're probably looking at a damaged system board.

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July 4, 2018 at 09:43:54
Have you tried booting off a Windows or Linux disc? If you can boot off a Windows disc, select Repair & then run System Restore - choose a date prior to the problem. Also, try starting the laptop with no RAM installed, just to see what type of beep codes or LED flash codes occur.

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July 4, 2018 at 11:13:13
Screen remains blank n power button light goes OFF in 3 secs, can I still boot from a CD or flash drive?

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July 4, 2018 at 14:41:52
"can I still boot from a CD or flash drive?"

I don't know if you can or can't, that's why I suggested you try & see.

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July 4, 2018 at 15:05:39
As recommended, try booting with one RAM stick installed, then the other. If either one works, replace the pair. If neither one works, it is likely something else.
As recommended, see if it can boot to a bootable CD or Flash Drive, Windows Repair if possible.
As recommended, try booting without RAM and see if error code in beep or flash.
Unplug hard drive and see if it can then boot to BIOS, then try without HD to a CD/DVD or Flash Drive to see if the drive is dead. If you cannot boot to BIOS then it is either really gone RAM or other major hardware problem.
Report results.
Depending on results, it may pay to think about replacing the laptop since this is apparently a very old laptop and not spending too much trying to get up and running again.
Assuming that the hard drive is working, you can plug it in using a USB adapter cable or external hard drive case to another computer and save your personal or work stuff on it (not programs though).

You have to be a little bit crazy to keep you from going insane.

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July 4, 2018 at 23:03:05
"can I still boot from a CD or flash drive?"

I don't know if you can or can't, that's why I suggested you try & see.

Riider I put my question the other way,

Considering my blank screen scenario, Plz guide me step by step, how shall I boot from a CD or Flash?

Any short cuts or key combinations, to help me reach the boot screen?

The GATE of the house is closed, if I manage to get in somehow, some options may come up...

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July 4, 2018 at 23:15:36
Hi Fingers,

Thanks for the detailed response,

Same behaviour in below cases in diff combinations, no beeps or other things, just the indicator LEDs in the pattern as in my original post,

- One, both or no RAM installed
- HDD is not installed
- CMOS not attached
- CD Drive not attaced

Even the same if all of above not present.

Three more questions here plz,

Plz suggest any way I could reach to the boot option screen?

Can both RAM modules damage together?

In a post I read to use Power+D, I tried n saw the screen testing performed by displaying diff colors one by one. So far this is the only thing working on my machine

Power+Fn doesn't work either.

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July 4, 2018 at 23:21:31
CMOS not attached??? You mean battery out or disconnected??

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July 4, 2018 at 23:32:15
Try the Lazesoft boot disk.

How to use a Lazesoft Windows Recovery CD or USB device to fix the boot problems if your Windows operating system does not start correctly.
"It is very common for PC users to be faced with a Windows crash. When this happens, the dreaded 'Blue Screen of Death' pops up, or your PC has a black screen and can not boot or start up"

Lazesoft Recovery Suite Home Edition
Screenshot ( SS )
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How to Boot a Computer from a Lazesoft Recovery USB Device
How to Burn a Lazesoft Recovery CD

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July 5, 2018 at 00:04:03
Sluc, CMOS is attached now. I just took it out to reset n see if there is a change in laptop behavior.

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July 5, 2018 at 01:15:29
One change just noticed,

With one RAM module, in either of the slots, both Charging n Wifi LEDs blink 22 times before dying, Storage LED remains solid.

If I put the other RAM module in any of the slots, only Charging LED blinks 22 times before dying, Wifi and storage LEDs remain solid.

Now advise plz...

If one mem module is OK, shall not system boot with it?

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July 5, 2018 at 05:10:58
Looking at the Dell blink codes for your laptop....

Storage LED solid + Power & Wifi LEDs both blinking = No memory modules are installed/detected.
Storage LED solid + Power LED blinking + Wifi LED solid = The memory modules are detected but have encountered an error.

It seems odd that both memory modules would go bad at the same time. Did something happen just prior to getting the BSOD that you're leaving out of your explanation? Do you have another RAM stick you can try? Your laptop supports up to 8GB (2 x 4GB) of DDR3.

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July 5, 2018 at 12:49:30
Thanks riider.

I had lots of tabs opened when first BSOD appered n after dump system shutdown.

I pressed power button n options appeared to choose between Normal Boot and Startup Diagnostic, considering BSOD I chose Startup Diagnostic

System boot again and in few sec showed BSOD again n shutdown.

After that I m stuck in this..

I am surprised too that how could both the modules get corrupt.

Dont have another module. I checked from my old Acer, but the fitting cut is at diff place on its modules so these cannot b put in dell.

Does BIOS loads in RAM too?

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July 5, 2018 at 13:01:53
Two possibilities.

Most probable is that one chip went bad at some point in the past. The machine still worked, except at half RAM, so it went unnoticed. Then the second, final, DIMM died, and here we are.

Second possibility is system board damage.

The test for either would to be to test the DIMMs in a known good system, and to test a known good DIMM in your system. Good news is if you end up buying a DIMM for this test, you fix your laptop and can call it quits. Bad news is if it is the system board, you end up with three possibly good DIMMs, and no system to plug them into.

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July 5, 2018 at 20:46:11
"Does BIOS loads in RAM too?"
Yes, BIOS loads into RAM. No RAM and No boot.

Did you try No main battery installed, AC power plugged in, try booting. This will test for a shorted main battery (or one or more cells with reversed polarity). If it boots to AC then battery is bad and needs replacing.

If you know anyone who has compatible RAM modules (even from older unused laptop) then a free test for completely bad RAM is possible. I shy away from spending too much because it appears to be an older laptop and few get much usable life past 4 or 5 years on laptops.

You have to be a little bit crazy to keep you from going insane.

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July 6, 2018 at 12:43:04
Thanks Razor 2.3...

Yes dear I tested on below

- Only AC power
- Only Battery
- Both AC n Battery

Results are same....

So far I believe I shall try to find out some matching RAM to make sure its a RAM issue or not, before ending up with a technician.

Many many thanks for all who spent some precious time of their lives, for helping a stranger. May Allah bless u all

Are there any hidden key combinations that coul help me reaching the boot screen.

I.e. Power+D makes screen show different colors to show that screen is in working order.

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July 6, 2018 at 14:11:57
Dell uses F2 to boot to BIOS set up.
F8 should get you advanced boot options.

You have to be a little bit crazy to keep you from going insane.

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July 7, 2018 at 23:17:03
Yes, but these work when screen is ON.

Power+D works in my case too...

So something like that,,,????

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July 8, 2018 at 20:59:44
If you are getting something on screen at boot attempt, even blinking dash then monitor, cable, and video circuit are all good. If nothing on screen at all or 'No Video Input' (Not likely on a laptop though) shows then hardware problem. Details on what you see will help us determine what it might be.

I still say that this laptop is very old and if at all possible, save the money you might put into it and replace it with a new (or a significantly newer reconditioned model with a warranty) laptop.

You have to be a little bit crazy to keep you from going insane.

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July 12, 2018 at 08:49:17

Many thanks for all the support dear...

Sorry for the late response, I was still struggling with it...

Two points of one of the RAMs were somehow touching each other, I tried to separate those with a pin, tried different tricks n system recovered by the Grace of Allah Kareem.

Now the problem is, BSOD is appearing may b 20 times a day.

Have ran memory diagnostics several times, even in extended mode too.

Tried startup repair as well, etc

Any help to get rid of it?

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July 12, 2018 at 09:01:21

For the time being, I am applying SP1 n few other updates, lets c how it goes...

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July 12, 2018 at 20:40:44
You definitely should have SP1 installed as well as all recommended updates after it.
You definitely should have more memory than 2GB, even with 32bit Windows 7. I recommend (once you pin down the problem) 4GB installed RAM (3.2-3.5GB usable if 32bit) and even 8GB or more if 64bit Windows 7 (I am running 16GB with Windows 7 64bit).

Memtest86 is bootable and is a better test for memory than the built in tools. It can be downloaded and made bootable from CD or Flash Drive.

You have to be a little bit crazy to keep you from going insane.

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July 12, 2018 at 22:55:13
I already have 4 GB...

Will give Memtest86, a try once I m up again, system is not booting again, not like before, this time windows is not booting.

One thing, while running diagnostics, why does it always say LCD CABLE UNPLUGGED, though lcd is working fine, even its touch too.

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