How to enable USB power when pc is off?


USB ports are a vital component of our PCs, allowing us to connect various peripherals like keyboards, mice, and external drives. However, many users are unaware that USB power can still be utilized even when their computer is turned off. In this article, we will explore the methods to enable USB power when the PC is off, along with answering some frequently asked questions related to this topic.

How to Enable USB Power When PC is Off?

The Answer:

To enable USB power when your PC is off, you need to access the BIOS settings and enable an option called “USB Power Share” or “USB charging” (exact terminology may vary depending on your motherboard model). This setting allows your USB ports to provide power even when the computer is not actively running.

Frequently Asked Questions (FAQs)

1. Can USB ports on a PC provide power when the computer is turned off?

Yes, USB ports can provide power when the PC is off, but it requires enabling a specific setting in the BIOS.

2. How to access the BIOS settings?

To access the BIOS settings, restart your computer and look for a message on the screen indicating which key to press (such as F2, Del, or Esc) to enter the BIOS. Press that key while the message is displayed.

3. Where can I find the “USB Power Share” or “USB charging” option in the BIOS?

The location of this option can vary depending on your motherboard manufacturer and BIOS version. Generally, it can be found under a section related to power management or USB settings.

4. Is enabling USB power in BIOS safe?

Enabling USB power when the PC is off is safe and does not pose any risk. However, it may slightly increase your standby power consumption.

5. Can I charge my phone using a USB port when the PC is off?

Yes, once USB power is enabled in the BIOS, you can charge your phone or any other USB-powered device through the USB ports when the PC is turned off.

6. Will enabling USB power in BIOS drain the PC’s battery?

No, enabling USB power in BIOS will not drain your PC’s battery as the computer is not actively running when it’s turned off.

7. Can I enable USB power when my PC is in sleep mode or hibernating?

No, USB power is only available when the PC is completely turned off, not in sleep mode or hibernation.

8. Can all USB ports provide power when the PC is off?

Not all USB ports on your PC may provide power when it’s turned off. Some motherboards may offer specific ports that support this functionality. Check your motherboard manual or BIOS for clarification.

9. Will enabling USB power affect my PC’s boot time?

Enabling USB power in BIOS should not impact your PC’s boot time significantly. However, the exact time may vary depending on your system configuration.

10. Can I charge devices using USB power during a power outage?

No, enabling USB power in the BIOS relies on the PC being connected to a power source. In case of a power outage, this functionality will not be available.

11. Will USB devices charge at the same speed when the PC is off?

The charging speed of USB devices when the PC is off may vary depending on the motherboard specifications. Some USB ports may offer faster charging rates compared to others.

12. Can USB devices draw power when the PC is in standby mode?

No, standby mode generally disables USB power. The device must be completely turned off for USB power to be available.


Enabling USB power when the PC is off can be a useful feature, allowing you to charge devices or power USB peripherals without having to keep your computer running. By accessing the BIOS settings and finding the appropriate option, you can easily enable USB power and make the most out of your USB ports even when your PC is turned off. Remember to check your motherboard manual or manufacturer’s website for specific instructions based on your hardware configuration.

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