Need help with black screen

[Don6032]

Hi I have a HP Pavilion Laptop model dk0055wm and it suddenly just wont show anything on the screen. I can hear the fans running and the power button is lit up but the screen is just black. The only error codes im getting is from the shift key blinking 3 times slow and 2 times fast. This keeps repeating over and over. I've already tried doing a bios reset (win+b) or (win+v) still no response and its giving the same error code. I would appreciate if anyone could me figure this out. (probably need to change ram, but need expert confirmation)

[Hawks_Eye]

Hi @Don6032 

Welcome to the HP Support Community! We're here to help you get back up and running.

Thanks for explaining everything so clearly—I’m really sorry you’re facing a black screen with blinking shift key codes. You’ve already done a great job trying BIOS recovery methods, and the fact that the fans and power light are active helps narrow this down. 

Let’s walk through a focused diagnosis to confirm whether this is a memory-related fault or something else.

What the blinking shift key means

The 3 slow blinks followed by 2 fast blinks typically indicate a memory (RAM) failure. This pattern is part of HP’s hardware-level blink code system used when the display cannot initialize. Since BIOS recovery didn’t respond and the screen remains black, RAM is the most likely cause.

Step-by-step actions to confirm and resolve

1. Perform a full power reset

• Disconnect the power adapter
• If the battery is removable, take it out
• Press and hold the power button for 30 seconds
• Reconnect power and try turning it on again
• Observe if the blink pattern changes

2. Reseat or replace the RAM module

• Power off and unplug the laptop
• Open the bottom panel (if accessible)
• Locate the RAM module(s)
• Remove and reinsert each module carefully
• If you have two modules, try booting with one at a time
• If available, test with a known-good compatible RAM stick

3. Test with external monitor

• Connect the laptop to an external display via HDMI
• Power on and check for output
• If the external screen remains black, the issue is deeper than display initialization

4. Confirm model-specific RAM specs
Your HP Pavilion dk0055wm typically uses DDR4-2400 or DDR4-2666 SODIMM

• Maximum supported memory: 16 GB
• If replacing, use a single stick of 4 GB or 8 GB for testing

5. Use HP’s startup troubleshooting guide
Visit the official HP support page:
HP Laptop Won’t Start – Troubleshooting Guide

Let me know how the system responds after reseating or replacing the RAM. You’ve done everything right by staying methodical, and I’ll be here to guide you through restoring full functionality.

If my response helped, please mark it as an Accepted Solution! ✅ It helps others and spreads support. 💙 Also, tapping "Yes" on "Was this reply helpful?" makes a big difference! Thanks! 😊

Take care, and have an amazing day!

Regards, 

Hawks_Eye