Can a Bad Power Supply (PSU) Cause No Display?

Can a Bad Power Supply (PSU) Cause No Display? Answered |

It can lead to a lack of power for the display, insufficient power delivery to the components, and no display output.

A faulty power supply unit is one possible cause of the computer’s inability to boot up. In this article, I will go through the most typical symptoms of a failing power supply, why they occur, and how to prevent them from happening in the future. A desktop computer’s PSU might be either 300 watts or less, 300 watts to 600 watts, or 600 watts or more. More expensive, yet able to deliver more power if the number is high enough.

As a result, rather than opting for a cheap PSU, pros always recommend ensuring optimum electrical usage for computers. But what if this surge route is suddenly severed? Or perhaps it’s been broken? How would you determine if your PSU is malfunctioning? Whether you have a modular or nonmodular power supply unit, this guide will help you choose the source of any issues and know when to upgrade.

Can a Bad Power Supply (PSU) Cause No Display?

Yes, a bad PSU can cause no display on a computer screen. Inadequate power supply hinders proper system boot-up, affecting critical components like the motherboard and graphics card. Troubleshooting or replacing the faulty PSU is essential to resolve and restore normal display function.

A faulty power supply with broken capacitors is one possible cause of the display problems that may be so annoying. However, the power supply might not be the only suspect. Incorrect voltage supplied by faulty PSU cables may also contribute to this issue.

Furthermore, the No Display problem can occur by several different PC parts, including the CPU, GPU, motherboard, BIOS chip, and random access memory. You need to take a systematic approach to pinpoint the faulty component in your computer system and fix it.

Here are some of the reasons why a bad Power Supply (PSU) causes no display:

Problematic Parts

The graphics card is just one of several components that could be harmed by power surges or erratic distribution if the power supply is incorrect. You may need a new graphics card in such a scenario. Fixing the faulty power source will stop the rest of the system from breaking down. Protect your electronics from power surges and spikes with a reliable surge suppressor or power conditioner.

Can a Bad Power Supply (PSU) Cause No Display? Answered |

Lack of Adequate Electricity Supply

The graphics card and other parts may not get enough juice to run smoothly if the power supply isn’t up to snuff. A faulty power supply unit (PSU) or one that is insufficient for the system could be to blame. Ensuring your power source can handle the demands of all your gadgets is essential. Upgrading to a better model could be a good idea if it falls short.

Problematic Capacitors

Several minor parts, including a circuit board, capacitors, transformer, and bridge rectifiers, make up a power supply. The smallest capacitors have the highest failure rate, although they may not be directly responsible for signal issues. You need to disassemble your Power Supply’s capacitors for inspection.

PSU Compatibility

It is crucial to check that the system’s power supply is suitable for its needs and compatible with its components. Ensure your power supply is compatible with your motherboard, video card, and other components. The user manual or website of the manufacturer is the best source of compatibility information. If the power supply fails to meet your computer’s needs, you should look into replacing it.

Can a Bad Power Supply (PSU) Cause No Display? Answered |

Changing Voltage Levels

Instability in the power supply can cause the graphics card to malfunction, resulting in no visual output. A voltage regulator or uninterruptible power supply (UPS) can solve this problem by regulating the voltage across the entire grid. You can fix this issue by switching to a new power supply unit (PSU) that is reliable and does not malfunction.


Overloading the power supply causes the system to malfunction, and if the power supply overheats, it may shut down entirely. Ensure the power supply’s wattage matches your system’s needs before installing it. Overheating the power supply is easily avoided by using additional cooling fans or enhancing the airflow within the computer casing.

Can a Bad Power Supply (PSU) Cause No Display? Answered |

Problems with the Connection or the Cable

Connector and cable malfunctions in an inferior power source might lead to inadequate or intermittent connections. Examine the power supply, video card, and monitor connections to ensure they are all in order. If the connection remains shaky, new cables or connections should be installed.

How to Fix a Bad Power Supply (PSU) Causing No Display?

You can do this by checking the power connections, verifying the functionality of the PSU, resetting the BIOS settings, checking the PSU overload, testing with minimal hardware, checking for physical damages, seeking professional help, and replacing the power supply.

It’s irritating and puzzling when your computer’s display suddenly goes black because of a defective power supply (PSU). Power supply reliability is crucial for the graphics card, which produces the display output. However, the computer is rendered useless when the power supply unit (PSU) breaks or malfunctions and the screen darkens.

Here’s how you can fix a bad Power Supply (PSU) causing no display:

Try Resetting the BIOS

In case of motherboard and power supply compatibility concerns, resetting the BIOS can assist. Find the CMOS battery on the motherboard and remove it to reset the BIOS. Make sure you unplug the system and the power is off. After waiting a few minutes, put the CMOS battery back in. It will restore the system BIOS to its factory settings. Try restarting the computer to see if the problem disappears.

Verify the Functionality of the PSU

You may check to see if the PSU is working correctly. The power supply unit (PSU) must first set its power switch to the “on” position. To check the power supply’s voltages, use a multimeter or power supply tester. You might also try swapping in a different power supply unit to see if the display problem remains. If the issue goes away when you swap power supplies, the defective one must be replaced.

Check the Power Connections

First, make sure that your system is getting power. Verify that the main power cable from the PSU is firmly connected to the power connector on the motherboard. Ensure the graphics card’s power cable is in and any other supplemental cables are securely attached. A faulty power connection may not always manifest as a problem with the screen. If required, reseat the cables and double-check their connection.

Can a Bad Power Supply (PSU) Cause No Display? Answered |

Check for PSU Overload

Verify that your power supply can deliver sufficient current to run the entire system. Consider the power consumption of your CPU, graphics card, HDD, and other components. Verify that your power supply unit (PSU) has enough wattage to meet your needs. If the power requirements are more than the PSU can provide, you may want to consider upgrading to a more powerful PSU.

Test with Minimal Hardware

Remove all peripherals and components that aren’t necessary. Disconnect everything except the motherboard, processor, memory, and video card. It allows you to determine if hardware incompatibilities or power constraints are to blame for the problem. If you can bring the display back up with minimum hardware, you can start plugging in the disconnected parts individually to determine which is malfunctioning.

Can a Bad Power Supply (PSU) Cause No Display? Answered |

Check for Physical Damages

Make sure there isn’t any physical damage to the power source by inspecting it thoroughly. Check for burning odors, bulging capacitors, and other obvious signs of damage. These problems point to the necessity for a new power source. The power supply unit (PSU) can fail due to physical damage, preventing any visuals.

Seek Professional Help

If you are unsure or uneasy about troubleshooting the power supply, a certified technician or the manufacturer’s customer service can assist you. They can guide you and suggest additional diagnostic procedures for your unique condition.

Replace the Power Supply

A new, well-tested one should be installed if the PSU is defective. Verify that the replacement power supply meets all of your system’s specifications. If you have the knowledge and equipment, you can try fixing the PSU by replacing worn-out parts like capacitors with new ones. But only qualified experts should attempt this, as doing so could cause additional problems.

Can a Bad Power Supply (PSU) Cause No Display? Answered |

Use a UPS

If you’re worried about power outages, use a surge protector or uninterruptible power supply (UPS) to safeguard your computer. Protect your equipment from harmful voltage fluctuations by installing one of these devices to manage and stabilize your main power. Power fluctuations can create display problems, although they can be mitigated using a surge protector or uninterruptible power supply.

Check for Overheating

The power supply’s and other parts’ efficiency can degrade in high temperatures. Make sure there are sufficient cooling methods for your system. All essentials are well-ventilated spaces, a clean computer case, and working fans. When the power supply fails due to overheating, the screen goes black. We recommend removing any built-up dust, as applying new thermal paste to the processor, and upgrading the cooling system.

Can a Bad Power Supply (PSU) Cause No Display? Answered |

Update BIOS or Drivers

Sometimes compatibility difficulties result in no display due to outdated BIOS firmware or graphics card drivers. Examine the maker’s website for your motherboard to see if any BIOS upgrades are available. You can enhance the compatibility and performance by installing a newer BIOS. If you want your graphics card and other hardware to perform at their best, you should update their drivers. Outdated drivers can cause problems with the display.

Check the Motherboard for Issues

Sometimes the motherboard is to blame for the lack of a display. Check the motherboard for physical damage like charred or blown components. You need to consult a professional technician if you suspect a problem with the motherboard.


It’s not usually the PSU’s fault when a PC has display issues. Inadequate power delivery, overloading, voltage fluctuations, component damage, broken connectors or cables, and PSU compatibility concerns are only some of the possible causes. A broken power supply may be at the heart of a malfunctioning display, but with the right troubleshooting techniques and fixes, you may get everything working again.

Checking the power connections, verifying PSU functionality, resetting the BIOS, inspecting for physical damage, testing with minimal hardware, seeking expert help if necessary, and replacing or repairing the power supply should resolve the underlying issue and restore display functionality.

Safety should always come first when working with the power supply or other internal components of a computer. If you feel uncomfortable or unsure about troubleshooting the power supply, it is best to see an expert. They may provide additional diagnostics and specialist guidance to help efficiently solve the issue.

Remember that the power supply is essential for operating the graphics card, which creates the display. A completely functional and reliable power source is required to keep performance at its peak and prevent display-related issues.

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