Fixed - Computer Turns On But No Display & No Signal In Monitor | CPU Fan Spinning But No Display

Introduction

This tutorial will guide you through troubleshooting a computer that powers on but shows no display or signal on the monitor. This issue can be frustrating, but by following these steps, you can identify the cause and potentially fix it.

Step 1: Check Power Connections

1. Ensure that the power cable is securely connected to both the computer and the outlet.
2. Verify that all internal power connectors (like the motherboard power cable and CPU power connector) are firmly seated.
3. If using a power strip or surge protector, try plugging the computer directly into the wall outlet.

Step 2: Inspect Monitor and Cables

1. Confirm that the monitor is turned on and functioning by checking the power indicator.
2. Check the display cable (HDMI, DVI, VGA) for damage and ensure it is securely connected to both the computer and the monitor.
3. If possible, test the monitor with a different computer, or test the computer with a different monitor to eliminate hardware issues.

Step 3: Reset RAM and Components

1. Power off the computer and unplug it from the outlet.
2. Open the computer case to access the internal components.
3. Carefully remove the RAM sticks:
   • Release the clips on either side of the RAM slots.
   • Clean the RAM contacts with a soft cloth or isopropyl alcohol if necessary.
   • Reinsert the RAM firmly into the slots.
4. Check other components, such as the graphics card, and ensure they are properly seated.

Step 4: Check for Beep Codes or LED Indicators

1. Power on the computer and listen for any beep codes. Refer to your motherboard manual to interpret these codes.
2. Observe any LED indicators on the motherboard to diagnose potential issues; refer to the manual for meanings.

Step 5: Clear CMOS

1. Turn off the computer and unplug it.
2. Locate the CMOS battery on the motherboard (a small round battery).
3. Remove the battery for about 5-10 minutes, then reinsert it.
4. Alternatively, use the CMOS reset jumper if available on the motherboard.

Step 6: Test with Minimum Hardware

1. Disconnect all non-essential peripherals (USB devices, additional drives, etc.).
2. Attempt to boot the computer with only the CPU, one stick of RAM, and integrated graphics (if available).
3. If the display works, reconnect components one at a time to identify the faulty hardware.

Conclusion

In this guide, we covered essential troubleshooting steps for a computer that powers on without a display. Key actions include checking power connections, inspecting the monitor, resetting RAM, and clearing the CMOS. If these steps do not resolve the issue, consider consulting a professional technician for further assistance or checking for hardware failures.