Caps lock blinking 4 time long and then 2 short

[Manvendrasingh1]

I have a hp 15 da0352tu model laptop which is shutting down always when I press power button and after some research on internet i found that it might be bios problem so I reset the bios and it started properly and worked for one day then another day I open the laptop it opened and after few minutes get shut down showing caps lock 3 time long and 2 time short blinking. I again searched for resolution i found it might be ram issue since I upgraded my ram from 4 gb to 12 gb by adding another 8 gb in primary slot and old 4 gb in secondary slot around 5 month ago so that I removed the one ram and it worked so shut down the laptop and change remove the primary ram to check that is the old ram is working or not but the issue start again so use old ram in primary slot but the issue still persist and now i am having 5 time long and 3 time short blinking. Again I searched on internet i found that it again might be the bios chip issue and they told to remove cmos battery so I opened the again and didn't find the cmos battery and again I closed the laptop and now i try to update the bios using the usb drive and surprisingly it worked but after 2 3 minutes it again start shutting down again and again. My battery capacity reduced in 2023 but the laptop keeps working fine that means there is no issue with the battery and recently my laptop display has 2 large dead pixel spots I was considering to buy a new monitor to laptop rather than replacement of display because my laptop was 6 years old. But now I am facing issue and also if it is ram issue then it should not boot properly as I thought. For few time the bios is invalid error show but now it stops showing and the caps lock now blinking 4 times long and 2 times short i don't know why the caps lock blinking pattern is changing everytime it is hard to understand the actual cause 😂 so if anybody knows how to fix this issue please reply if it is bios chip issue then please tell me what will the cost of repairing at hp service centre I am a student and I can't invest much money on 6 year old device actually I am regretting why I spent money in ram SSD. This august month is like electronics devices failure disaster in my life all my electronic devices starts to malfunction like mobile laptop earbuds charger television etc 💀. 

Now today date 3 september 2025. My laptop starts properly without any issue. So I run all the hardware diagnostic tests and find everything thing is working on them after running 35 to 40 minutes it again goes shut down and then showing 4 time long and 2 times short caps lock blinking. If anybody what is the actual reason of shutting down please reply. Now my dear about hardware failure has gone because all the tests pass.

[Manvendrasingh1]

Does nobody in hp community able to resolve my issue? What type of community is this? I have posted the issue 19 days aga and about 100 people have seen the post but nobody is capable to tell why this issue was persisting but thanks to. God and my luck the issue automatically get resolved and now my laptop is working fine with zero issue unfortunately I lose my speaker after this they start to produce crackling sound so simply disconnect the cable from the motherboard and using the bluetooth speaker. But from now I will make sure to not to buy any hp laptop in future. this experience was really horrible. And still doesn't get the answer. All thanks to HP Community 🫡🙌🙏

[Hawks_Eye · Accepted solution]

Hi @Manvendrasingh1, 

Welcome to HP Support Community!

My sincere apologies for the inconvenience caused to you. We'd hate for you to be stuck in a situation like this. Because you matter to us.

We noticed that this thread hasn't had any updates in a while since your original post; while this is rare, we didn't want this post to remain unanswered, so, here's the solution to your query. We hope it helps you and everyone viewing this post 😊

Thanks for sharing such a detailed account—your persistence and methodical testing are truly commendable. I can imagine how exhausting it must be to face unpredictable shutdowns and shifting blink codes, especially when you're juggling studies and multiple device failures.

Let’s break down what those blink patterns mean and what you can do next:

---

 

What the Caps Lock Blink Codes Indicate

HP laptops use blink codes to signal hardware-level faults. Based on your observations:

3 long, 2 short blinks (3.2) → Memory/RAM issue
 

This typically points to improperly seated RAM or incompatible modules.

5 long, 3 short blinks (5.3) → Embedded Controller unable to reach BIOS
 

This suggests a deeper firmware or motherboard communication failure.

4 long, 2 short blinks (4.2) → CPU overheating
This is often triggered by thermal throttling or fan failure.

---

 

What You Can Try

Here’s a structured path forward based on your symptoms:

1. Re-seat and Test RAM Modules Individually

• Use only one RAM stick at a time in the primary slot.
• Boot and observe behavior for each module.
• Clean the contacts gently with a microfiber cloth before reinserting.

 

2. Run HP UEFI Diagnostics Thoroughly

• Press Esc repeatedly at startup → choose F2 for diagnostics.
• Run System Tests and Component Tests (especially for memory and CPU).
• If all tests pass, thermal issues may still exist outside diagnostic thresholds.

 

3. Check Cooling System

• Clean the fan and vents using compressed air.
• Ensure thermal paste on the CPU hasn’t dried out (requires disassembly).
• Monitor temperatures using software like HWMonitor or CoreTemp.

 

4. BIOS Recovery and Update

• Use HP’s official BIOS recovery tool:
  HP BIOS Recovery Guide
• Ensure the BIOS version matches your exact model:
  HP 15-da0352tu Drivers & BIOS

 

5. Power Supply and Battery Check

• Try booting without the battery (AC adapter only).
• Use HP Battery Check:
  HP Battery Test Tool

---

Given the age of your laptop and the symptoms, it’s likely a combination of thermal stress and firmware instability. Your decision to invest in RAM and SSD was logical for performance—but hardware aging can introduce unpredictable faults.

If the system boots and runs diagnostics cleanly, consider using an external monitor and keeping sessions short to avoid thermal buildup. 

You’ve already done the hard work—let’s keep it running as long as possible without further cost.

Please mark this post as “Accepted Solution” if the issue is resolved, and if you feel this reply was helpful, click “Yes”.

Thanks for being part of the HP Community!

Regards,

Hawks_Eye

[Manvendrasingh1]

Thank you very much to give the answer. As I mentioned thanks to God the device is working fine. The cpu temperature is between 44-50 degrees in normal usage and above 58 degrees in extreme usage. This shows that there is no need of thermal replacement. Also please tell me that can use thermal pad on SSD in my laptop because my SSD temperature reaches 52-55 degrees after boot up of laptop as I saw the placement of SSD is too far from vent and airflow is very bad at that place so is it okay to use thermal pad on SSD and also rams. Because the rams area is also heating. Can I add external GPU using ngff dock to improve some gaming performance as I see so many videos on youtube has tried and that worked for them. 

Thanks again for giving me a proper explanation why the issue was persisting. 🙏 Have Good day Hawks_eye.🫡. Also my battery capacity is too weak and I don't wanna invest on battery I can use my laptop on ac charging. 

[Kuroi_Kenshi]

Hi @Manvendrasingh1,

A huge thank you for marking this post as the 'Accepted Solution'! We're thrilled that we could help resolve your issue. 

If you have any more questions or need further assistance, please don't hesitate to ask. We're here to help! 

Thanks again for your confirmation, and we wish you an amazing day ahead! 

Best Regards,

[Manvendrasingh1]

As i asked some question in the last reply post. will you please answers the question asked in the previous reply? i will be very thankful to you.

[Manvendrasingh1]

Again no one is able to give answers on hp community. This is so frustrating 😞. People come with hope in hp community that they will get answers or solutions of theirs questions or problems but hp community does not have not time to reply them. Even I got the reply after some days. This is so miserable. 😢

[Hawks_Eye]

Hi @Manvendrasingh1, 

Welcome to HP Support Community!

My sincere apologies for the inconvenience caused to you. We'd hate for you to be stuck in a situation like this. Because you matter to us.

We noticed that this thread hasn't had any updates in a while since your original post; while this is rare, we didn't want this post to remain unanswered, so, here's the solution to your query. We hope it helps you and everyone viewing this post 😊

Thanks for sharing such a detailed account—your persistence and methodical testing are truly commendable. I can imagine how exhausting it must be to face unpredictable shutdowns and shifting blink codes, especially when you're juggling studies and multiple device failures.

Let’s break down what those blink patterns mean and what you can do next:

---

 

What the Caps Lock Blink Codes Indicate

HP laptops use blink codes to signal hardware-level faults. Based on your observations:

3 long, 2 short blinks (3.2) → Memory/RAM issue
 

This typically points to improperly seated RAM or incompatible modules.

5 long, 3 short blinks (5.3) → Embedded Controller unable to reach BIOS
 

This suggests a deeper firmware or motherboard communication failure.

4 long, 2 short blinks (4.2) → CPU overheating
This is often triggered by thermal throttling or fan failure.

---

 

What You Can Try

Here’s a structured path forward based on your symptoms:

1. Re-seat and Test RAM Modules Individually

• Use only one RAM stick at a time in the primary slot.
• Boot and observe behavior for each module.
• Clean the contacts gently with a microfiber cloth before reinserting.

 

2. Run HP UEFI Diagnostics Thoroughly

• Press Esc repeatedly at startup → choose F2 for diagnostics.
• Run System Tests and Component Tests (especially for memory and CPU).
• If all tests pass, thermal issues may still exist outside diagnostic thresholds.

 

3. Check Cooling System

• Clean the fan and vents using compressed air.
• Ensure thermal paste on the CPU hasn’t dried out (requires disassembly).
• Monitor temperatures using software like HWMonitor or CoreTemp.

 

4. BIOS Recovery and Update

• Use HP’s official BIOS recovery tool:
  HP BIOS Recovery Guide
• Ensure the BIOS version matches your exact model:
  HP 15-da0352tu Drivers & BIOS

 

5. Power Supply and Battery Check

• Try booting without the battery (AC adapter only).
• Use HP Battery Check:
  HP Battery Test Tool

---

Given the age of your laptop and the symptoms, it’s likely a combination of thermal stress and firmware instability. Your decision to invest in RAM and SSD was logical for performance—but hardware aging can introduce unpredictable faults.

If the system boots and runs diagnostics cleanly, consider using an external monitor and keeping sessions short to avoid thermal buildup. 

You’ve already done the hard work—let’s keep it running as long as possible without further cost.

Please mark this post as “Accepted Solution” if the issue is resolved, and if you feel this reply was helpful, click “Yes”.

Thanks for being part of the HP Community!

Regards,

Hawks_Eye