"HP Compaq DC5800 Micro Tower: When I turn on the PC, the fan runs at full speed after startup and n

[medja3far]

When I turn on the PC, it powers on normally, but the fan runs at full speed after startup and no data appears on the monitor, even after unplugging and reconnecting the power supply pls help me

[Sneha_01]

Hi @medja3far 

Welcome to HP Support Community.

Thank you for posting your query, I will be glad to help you.

It sounds like your HP Compaq DC5800 Micro Tower is experiencing a boot issue where the fan runs at full speed but the monitor remains blank. Here are some steps to help troubleshoot the problem:

1. Check Monitor and Connections

• Ensure that the monitor is powered on and properly connected to the PC.
• Try using a different monitor or cable to rule out display issues.

2. Inspect Hardware Components

• RAM: Reseat the RAM modules. If you have multiple sticks, try removing them one at a time and booting with just one to see if one of them is faulty.
• Graphics Card: If there’s a dedicated graphics card, reseat it. If you can, try using the onboard graphics instead.
• Check Connections: Ensure all internal connections (cables, drives, etc.) are secure.

3. Reset BIOS/CMOS

• Locate the CMOS battery on the motherboard and remove it for a few minutes, then reinstall it. This will reset the BIOS settings.
• Alternatively, you can look for a CMOS reset jumper on the motherboard.

4. Listen for Beep Codes

• If your motherboard has a speaker, listen for any beep codes when you turn it on. These can indicate specific hardware issues.

5. Check Power Supply

• Ensure the power supply is functioning properly. If possible, test with another compatible power supply.

6. Perform a Minimal Boot

• Disconnect all peripherals and non-essential hardware (extra drives, USB devices) and try to boot with just the CPU, one stick of RAM, and the onboard graphics.

7. Look for Visual Indicators

• Check for any LED indicators on the motherboard or inside the case that might indicate errors.

I hope this helps.

Take care and have a good day.

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

Rachel571

HP Support