Can't see BIOS screen, HP Logo doesn't show, tried everything

[ankeSuk]

I've an old HP desktop PC. It was working fine and then went kaput today. Figured out that CMOS battery was dead so replaced with a new battery. 

It is not showing BIOS no matter what I do. It is not even showing HP logo.

When I turned PC On, monitor wakes up and then after few second monitor says no signal. 

PC does beep though.

I've tried following

- Windows +b + power

- Windows +v + power

- Disconnected CMOS and put it back again

Also tried steps mentioned on https://support.hp.com/rs-en/document/ish_3966820-3438449-16 

Removed all RAM modules and just installed one to make sure RAMs are not causing issue.

Is it BIOS issue or any hardware issue? How to find out?

[Nal_NR]

Hi @ankeSuk,

Welcome to the HP Support Community. 

I'd be glad to help you! 

It’s frustrating when a computer doesn't show any signs of life beyond a monitor signal issue. Since you’ve already replaced the CMOS battery and tried RAM reseating and BIOS recovery steps, we can focus on isolating the problem further.

• How many beeps does the PC make during startup? (The pattern or number of beeps often indicates a specific issue.)
• Does the system power off or restart on its own after attempting to turn on?
• Have you checked for loose connections or reseated other components (e.g., GPU, cables, or storage drives)?
• Does the PC have an integrated GPU, or are you using a dedicated graphics card?

Try Steps to Diagnose and Resolve:

Check Beep Codes:

• Consult your HP desktop manual or HP support online for beep code meanings. The beeps can pinpoint whether the issue is with the motherboard, RAM, GPU, or another component.

Clear CMOS Again:

• Disconnect the power supply, remove the CMOS battery, and hold down the power button for 30 seconds to ensure a full discharge.
• Reinsert the battery and try booting again.

Test Without Peripherals:

• Remove all unnecessary peripherals (e.g., USB devices, additional RAM, and storage drives).
• Try booting with only the CPU, one stick of RAM, and integrated graphics (if available). Check for changes in the beep pattern or screen display.

Test the Display Output:

• If using a dedicated graphics card, switch to the motherboard's integrated graphics output.
• Test the PC with another monitor or a different cable (e.g., HDMI, VGA, or DVI).

Inspect for Hardware Damage:

• Look for visible signs of damage or swelling on the motherboard, such as blown capacitors or burnt traces.

Power Supply Unit (PSU) Check:

• Ensure the PSU is providing adequate power. If possible, test the system with another compatible PSU to rule out power delivery issues.

If this does not help, The issue might be with the motherboard, particularly if the BIOS isn't loading or the HP logo isn’t showing.

Hope this helps! Keep me posted for further assistance

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

[ankeSuk]

Hello,

I've been checking it with various issues since I posted this question here. I'm still not able to resolve this issue.

• How many beeps does the PC make during startup? (The pattern or number of beeps often indicates a specific issue.)

It beeps only once as it would normally do.

Few more inputs

- I've already tried remove CMOS batter few times

- I've disconnected all peripherals and RAMs. Kept only one RAM and tried on different RAM slots with different RAM modules

- There is no sign of any burn or any damage at all

- It has integrated GPU

- LED light comes on the motherboard and both CPU and main fans are working

I tried flashing BIOS using USB, no luck

I think either motherboard or CPU is dead assuming there are no faults in the power cables. 

Any further suggestions?

[Nal_NR]

Hi @ankeSuk ,

We apologize for the inconvenience. The issue seems to persist even after attempting the troubleshooting steps mentioned above.

This might require one-on-one interaction via remote assistance to fix the issue over the phone. 

I've sent you a private message with further instructions. In order to access your private messages, click the private message icon on the upper right corner of your HP Support Community profile, next to your profile Name or simply click on this link.

If the information I've provided was helpful, give us some reinforcement by clicking the Accepted Solution button, that'll help us and others see that we've got the answers!