Pc turning on for 5 seconds without video output.

[Aleksander5]

the computer turns on immediately after connecting the power cable,
 the LED on the power button does not light up,
 there is no image,
 the computer turns off after 5 seconds.
Please help.

[Raj_05]

Hi @Aleksander5,

Welcome to the HP support community.

Please help us with your HP unit serial number or the product number on a private message for further assistance.

Here is the link to find the product number:- Click here

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.

Alden4

HP Support 

[Raj_05 · Accepted solution]

Hi @Aleksander5,

Thank you for your response, 

It sounds like your HP Pavilion 590 PC is experiencing a hardware issue. Here are a few steps you can try to diagnose and possibly fix the problem.

Check Power Connections:

• Ensure that all power cables are securely connected, including the 24-pin ATX power connector and the 4/8-pin CPU power connector.
• Confirm that the power supply unit (PSU) is functioning correctly. If you have a spare PSU, try swapping it out to see if that resolves the issue.

Inspect Components:

• Remove and reseat the RAM modules. Sometimes, improperly seated RAM can cause boot issues.
• Reseat any expansion cards (graphics card, etc.) and ensure they are firmly connected.

Check for Short Circuits:

• Make sure there are no loose screws or other objects causing a short circuit. Remove the motherboard from the case and test it outside of the case to rule out short circuit issues.

Remove Peripheral Devices:

• Disconnect all peripheral devices (keyboard, mouse, external drives) and try booting the computer with only the essentials connected.

Clear CMOS:

• Try resetting the BIOS settings by clearing the CMOS. This can usually be done by removing the CMOS battery for a few minutes and then reinserting it. Alternatively, you might have a CMOS reset jumper on the motherboard.

Test with Minimal Hardware:

• Disconnect all non-essential hardware and try booting with just the CPU, one stick of RAM, and integrated graphics (if available).

Listen for Beep Codes:

• If your motherboard has a speaker or beep codes, listen for any beeps that might indicate a specific problem. Refer to your motherboard’s manual for beep code meanings.

Check the Power Button:

• Sometimes, a faulty power button or its connection can cause boot issues. Make sure the power button is functioning correctly and connected properly to the motherboard. 

Please click “Accepted Solution” if you feel my post solved your issue, it will help others find the solution. Click the “Kudos/Thumbs Up" on the bottom right to say “Thanks” for helping!

Take care and have a great day ahead!

Alden4

HP Support