HOW can i resolve my dell led blinking problem

February 6, 2018 at 05:05:08
Specs: Windows 10, 2GB
my Dell Latitude D520 is not working, when turned on, one led near the power button at the far left gives a solid green light while two others keeps on flashing for about 30 seconds and then stops.

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February 6, 2018 at 08:15:36
This apparently is quite an olde laptop (2006 vintage?); and I'm a little surprised that it will even consider win-10 as a viable OS - let alone run on it...?

Regardless it may be the battery is simply tired and worn out as they say; or equally the mains adapter/charger unit is failing

This is the manual for your model: and the brief description early on includes what the lights signify:

The led to the left merely indicates that power is applied (and that doesn't mean it is the correct voltage level in).

The middle one is the hard drive - it flashes etc.when the hard drive is being accessed.

The third one (the right hand one) is the battery indicator led... When the battery is charged that led is steady. When the battery is low or being charged - it flashes...

A few possibilities come to mind...

The charger (mains adapter) is faulty and not delivering the correct voltage in. These adapters can and do often fail over time. They may deliver sufficient to illuminate the power on led but that's about all.

The battery may be failing and shorting out voltages required to both charge the battery and also run the laptop. To check this try the following.

Remove the battery and the mains adapter. Press and hold the on/off button on the laptop for about 30seconds. This discharges all stored energy in the onboard components (capacitors various store power for a wee while after switch off; and this routine discharges them).

Restore the mains adapter power "only"; and see if the laptop will now boot OK. If it doesn't then the mains adapter is highly suspect...? If you can borrow a known good one then do so and test again - without the battery installed...

If it does boot ok with the original mains adapter - and it "might" - then power down, remove the mains adapter too. Re-install the battery, re-apply the mains adapter and switch on... See what happens then?

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February 6, 2018 at 12:39:30
LED blink codes. Click the D-series Diagnostics:

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February 6, 2018 at 15:56:57
If the suggestions I posted don't resolve it... then based on some of the led codes in the link "riider" posted... you might consider removing RAM sticks and cleaning their edge connectors - with a soft pencil style eraser. Wipe edges clean afterwards with a lint free cloth (even a kleenex); re-insert one stick - firmly. Then remove it and re-insert a second time; then a third time and leave it there after that. If more than one stick repeat process with the other stick(s).

Why insert/remove RAM sticks as above, after cleaning their edge connectors? This is to clean their socket connector surfaces too. RAM connections can oxidise over time - especially if they've been around for a long time. Equally RAM can sometimes become less than perfectly seated too over time; especially in laptop systems...

Be sure to remove both the mains adapter input - "and" the battery; thus ensuring that "all" power sources are disconnected/removed - before removing the RAM etc...

When RAM cleaning is complete as above, connect the mains adapter - leave the battery out at this stage. If things are now OK... then power down and remove the mains adapter connection.

Re-install the battery, and see if laptop will boot on battery alone (not very likely I suspect). Then switch laptop pff and reconnect the mains adapter too - with the battery still installed. Power up and see what happens...

If system boots OK then presumably all is now OK. If it doesn't boot with the battery installed - but will without the battery removed and laptop now running on mains adapter only... then the battery is suspect?

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Related Solutions

February 12, 2018 at 06:07:53
hie, i have tried all the instructions from the first answer and the second answer but there is no change. i don't really no what next i can do. but i really appreciate your help.

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February 12, 2018 at 07:45:19
Do you hear the fan come on? Does it stay on?

Do you hear the hard drive working? Does it sound like
it is loading Windows normally?

Do you see anything at all on the screen? If so, what?

-- Jeff, in Minneapolis

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February 13, 2018 at 06:20:50
Hie Boss, today i tried again to open that computer, i tried to change the RAMs, but i have discovered that if i put a RAM at the slot near the keyboard, the same thing happen. but if i remove it, and leave only one RAM at the base, the computer boot normally.

should i say, the slot is damaged?

what can you advise from here?


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February 13, 2018 at 06:35:00
Does the same situation exist if you switch the RAM stocks aoround?

Will the system work OK with pnly one of tne stick installed - as in try with each stick in turn on its own...

And have you cleaned both sticks (and slots) as in my #1 ?

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