Pressing power button turns on keyboard light but nothing else happens

Question

HP EliteBook Folio 9480m

The HP Elitebook Folio 9480m was released on July 4, 2014. The 9480m model can be identified by model number J5P80UT.

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Pepe @pepefix

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投稿日: 2021年11月14日

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Pressing power button turns on keyboard light but nothing else happens

When I press the power button, the keyboard lights will enter some kind of loop, where they turn on and off repeatedly, but nothing else happens, no image on screen, no boot messages or image, nothing.

I tried replacing the battery with a new one, and tried using a different charger, and still have the same issue.

A late update: ~1 month after resolving the issue, the laptop started having similar problems again. To solve them, i just removed 1 of the RAM modules. Haven't had any more issues, apart from a defective battery. So it seems the problem was the RAM.

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so, what shall i do?

Libanos Ayza さんによる2022年6月13日

Hi @Libanos Ayza,

You asked a question in the "Comments" section.

Ask a more specific question. What have you tried so far? We need details.

mike さんによる2022年6月13日

yes i was haing the same problem

later i found i was the ram (left one for me) i simply remove it and magicly the pc has turn on magically thanks for your update

Ali Achraf さんによる2023年7月12日

Hi,

I have the same problem but my hp laptop battery cannot be removed. What do I do?

Ola さんによる2023年9月18日

@ola42908

What is the make and model number of the laptop as shown on the product info label on the bottom of the laptop?

jayeff さんによる2023年9月18日

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jayeff @jayeff

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投稿日: 2021年11月14日

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Hi,

Try a full power refresh and check if that resolves the problem.

Here’s the procedure:

Disconnect the charger from the laptop.

Remove the main battery from the laptop.

Disconnect the RTC coin cell battery from the motherboard.

Here’s the maintenance and service guide for the laptop. Go to p.29 & p.37 to view the necessary pre-requisite steps and then the procedure to remove the main battery and the RTC battery, respectively.

Press and hold the laptop’s Power On button for a full 30 seconds and then release it.

Reconnect the RTC coin cell battery, re-assemble the laptop, re-insert the main battery, connect the charger to the laptop and try to start it.

If it starts, there may be a message about the date and time being incorrect. This is normal as the above procedure has reset the BIOS back to its factory defaults. Once the date and time have been adjusted, the message won't appear the next time the laptop is started. Any user defined BIOS settings that have been altered by you to suit your particular requirements will need to be changed back also.

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It still does the same, only now I didn't have to press any button, just reassembled the laptop and the keyboard started to flash repeatedly again.

Pepe さんによる2021年11月14日

Just tested, and it does the same thing when i connect only the charger, and not the RTC or the battery

Pepe さんによる2021年11月14日

I already solved the problem, but didn't get any message.

Anyways, thanks for your help! ?

Pepe さんによる2021年11月14日

How do you solve the problem? I am on the same problem.

Biruk Ayele さんによる2022年8月1日

Me too. Keyboard and Three diods on the front flashes Every five seconds. A fourth diod flashes tight After the others Three also every five Seconds . Skick flashes.

alex さんによる2022年8月8日

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Hi @Libanos Ayza,

You asked a question in the "Comments" section.

Ask a more specific question. What have you tried so far? We need details. — mike
yes i was haing the same problem

later i found i was the ram (left one for me) i simply remove it and magicly the pc has turn on magically thanks for your update — Ali Achraf
Hi,

I have the same problem but my hp laptop battery cannot be removed. What do I do? — Ola
@ola42908

What is the make and model number of the laptop as shown on the product info label on the bottom of the laptop? — jayeff
It still does the same, only now I didn't have to press any button, just reassembled the laptop and the keyboard started to flash repeatedly again. — Pepe
Just tested, and it does the same thing when i connect only the charger, and not the RTC or the battery — Pepe
I already solved the problem, but didn't get any message.

Anyways, thanks for your help! ? — Pepe
Me too. Keyboard and Three diods on the front flashes Every five seconds. A fourth diod flashes tight After the others Three also every five Seconds . Skick flashes. — alex

Pepe @pepefix 評価: 168 4 2 1 · Answer 1 · 2021-11-14T12:58:38-07:00

Pepe @pepefix

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投稿日: 2021年11月14日

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This is how I ended up solving the issue:I changed the order of the 2x8 ram modules after following the steps @jayeff mentioned, then it booted up normally. Also, after resetting the RTC battery, i waited for a while (~10-15 min) before doing the ram change.

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One thing to try for the future is with both the laptop battery and RTC battery aka (CMOS battery) disconnected, press and hold the power button for a few seconds. This will discharge the capictors on the motherboard and fully clear the CMOS (which stores the BIOS settings).

The RAM change probably did a memory re-train which can solve issues sometimes.

NybbleLynx さんによる2021年12月17日

Hi @nybblelynx,

More likely just the reinserting of the RAM did it. In 35 years of computer repair I have never heard of "re-training" memory. Just curious. Do you have a reference for this?

mike さんによる2021年12月17日

just had the same problem.

changing the ram and slots solved the problem!

we are awesome さんによる2022年6月3日

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HP EliteBook Folio 9480m

Pressing power button turns on keyboard light but nothing else happens

Update (11/14/2021)

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