Latitude e6440 Black Screen/No Boot

January 31, 2020 at 23:28:44
Specs: Windows 10, 8GB
Latitude e6440
Windows 10
8GB DDR3
Uses: Light gaming and Mobility

So this laptop was given to me a few years ago as broken but all it needed was working RAM and I had that laying around. It hadn't been used for the past 5 months when I pulled it out to upgrade the firmware on my router. It boot up, fully loaded and then I opened a web page. The whole thing freezes but doesn't shut off so I hold the power button to power it down.

Now, when you push the power button; there is light on the power button, The fan spins up, the HDD spins up and then quickly there is a click and everything stops. After that, the WiFi Light is on, The battery light is on and the HDD light is blinking. During all of this, nothing is on the screen at all. No beeping either.

What I have tried:
Removing battery
Only using power adapter without battery
Holding power button for 1min with adapter and battery removed
Removing RAM one at a time
Reseating RAM
Removing HDD
Making sure only the essentials are attached when booting

The last two things I can think of is, the MoBo or the CPU. I can't test the CPU because I don't have another laptop to put it in. I haven't pulled the MoBo out completely but so far I don't see any damage. Is there anything else to try that I missed?

My other questions; Should I fully pull the MoBo and inspect with a fine tooth comb or does this resemble a definite CPU failure? If the CPU went out, should I suspect something is up with the MoBo also and not chance putting a new CPU in here? The CPU itself runs new @$140 and used @$60. Should I put $140 into this or go used since this Laptop is older?


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#1
February 1, 2020 at 06:26:44
The "click" is usually an indication that the HDD is bad. What happened when you tried to boot with the HDD removed?

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#2
February 1, 2020 at 10:18:24
The fact that there is NEVER ANYTHING on the screen suggests
that the problem is before the hard drive. That is true if you normally
saw something on the screen before Windows began to load.

My 3 wild guesses are power supply circuitry, motherboard, or CPU.
A capacitor seems to be the most likely component to fail, and
sometimes is discernable by visual inspection. You might want to
look again if you think you might have missed noticing it, since it
doesn't necessarily jump out at a quick glance.

-- Jeff, in Minneapolis


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#3
February 1, 2020 at 21:03:08
@riider
I think the click is the HDD stopping due to the laptop failing to boot. I just put the HDD in there from another computer so I know that isn't the culprit.

@Jeff Root
Yes it's a Dell so before windows it is supposed to show the Dell logo and now it shows nothing. I suppose I will pull the board and do a full inspection then, ty.


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Related Solutions

#4
February 1, 2020 at 21:14:08
A click is usually a hard drive but with the hard drive removed, it should have booted to BIOS set up.
Did you try cleaning the edge connectors of the RAM with a soft clean pencil eraser, wiping with a soft cloth, and then popping them in and out of the sockets 4-5 times.
When inspecting a motherboard use a small strong flashlight and look over the board in slow narrow rows. The flash light beam will help you focus your eyes on only a narrow portion of the board forcing you to notice things you would normally miss. Capacitors that bulge or leak (tops are always flat, not convex curved), brown spots on resistors, diodes, transistors, or even the board are also bad news.
It is not very easy to burn out a CPU without overvolting it, even overclocking will usually just cause thermal throttling or shut down though there is always the possibility of a weak one.

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


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#5
February 2, 2020 at 01:02:43
You say that you just put the hard drive in from another
computer. Did you re-install Windows? Was the drive
from an identical computer? I would not expect Windows
to work on a computer that is much different from the
computer it was installed on. That might be the cause.

Try starting with the drive unplugged. If it works, you will
likely need to re-install Windows.

-- Jeff, in Minneapolis



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#6
February 3, 2020 at 01:00:00
If the Hdd light keeps blinks during boot, then it seems windows is loading. Possible the display or GPU maybe be the problem. Have you tried an external monitor/display?

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