Can’t boot into bios, now after cmos reset everything powers on but I have no signal to monitor

Troubleshooting Guide: Resolving BIOS Access and No Signal Issues on ASUS Prime B650-Plus Motherboard

Introduction

Experiencing difficulties accessing the BIOS or encountering no display signal can be frustrating, especially after attempting various troubleshooting steps. This article provides a comprehensive overview of common issues related to BIOS entry failures and monitor signal loss, alongside effective solutions tailored for users of the ASUS Prime B650-Plus motherboard.

Common Challenges

• Inability to Enter BIOS

• Monitors not displaying during startup, automatically booting into Windows

• No signal after CMOS reset

• Peripheral lights and power supplied, but no display output

Initial Troubleshooting Steps

1. Verify Keyboard Functionality

Ensure your keyboard is connected via USB and recognized during startup. Use a wired keyboard with direct connections to the motherboard’s rear ports for reliable response. Note that sometimes, pressing ‘Delete’ or ‘F2’ may not register if the USB device initializes late; try using PS/2 keyboards if available or wait until the system detects the keyboard before pressing keys.

1. Attempt BIOS Entry via Alternate Methods

2. Use the BIOS Flashback feature if available on your motherboard. This allows updating or restoring BIOS without entering BIOS setup.

3. Clear CMOS again: Disconnect power, remove the CMOS battery for at least 10 minutes, then reinsert and reconnect power.

4. Check Display Connections and Settings

5. Ensure the monitor is connected to the correct output port. Switch between HDMI, DisplayPort, DVI, or VGA if available.

6. Confirm that input source on the monitor is set correctly.

7. Test with different cables or monitors to rule out hardware issues.

8. Confirm Graphics Configuration

9. If using integrated graphics, make sure the monitor is connected to the motherboard’s display output.

10. If relying on dedicated GPU, ensure the GPU is properly seated, power connectors are attached, and the GPU is supported by the motherboard.

Advanced Troubleshooting

• Reset BIOS Settings

If BIOS setting misconfigurations are suspected, perform a CMOS reset:

a. Turn off the PC and unplug from power source.

b. Remove the CMOS battery carefully.

c. Wait 10-15 minutes for residual charge to dissipate.

d. Reinstall the battery, reconnect power, and turn on the system.

• Update BIOS Using BIOS Flashback

If possible, update your BIOS to the latest version to improve hardware compatibility and stability:

a. Download the latest BIOS file from ASUS support website.

b. Rename the BIOS file as