How to Fix: Pc won’t boot and is says no signal unless cmos is reset and it only goes to bios when I try exit bios it goes back to no signal
Fix Pc won’t boot and is says no signal unless cmos is. Try replacing the motherboard as a last. Step-by-step guide included.
📋 Table of Contents
The error 'no signal' on a PC that only boots when the CMOS is reset and fails to boot after exiting the BIOS is often caused by a faulty video card or graphics driver. This issue can also be related to a malfunctioning power supply unit (PSU) or a failing motherboard.
⚠️ Common Causes
- Faulty video card or graphics driver
- Malfunctioning power supply unit (PSU)
- Failing motherboard
🛠️ Step-by-Step Verified Fixes
Method 1: Video Card Replacement
- Step 1: Disconnect the power cord from the back of the PC and unplug any other cables.
- Step 2: Open the case and locate the video card. If it's a PCIe card, you may need to remove screws to access it.
- Step 3: Carefully pull out the video card from its slot. Be careful not to touch any of the pins on the card or the motherboard.
- Step 4: Inspect the video card for any signs of physical damage or burn marks. If it's damaged, replace it with a new one.
- Step 5: Reinsert the new video card into its slot and secure it with screws. Reconnect the power cord and plug in any other cables.
- Step 6: Enter the BIOS settings by pressing F2 during boot-up. Save the changes and exit the BIOS.
Method 2: Graphics Driver Update
- Step 1: Download the latest graphics driver from the manufacturer's website.
- Step 2: Disconnect the power cord from the back of the PC and unplug any other cables.
- Step 3: Open the case and locate the video card. If it's a PCIe card, you may need to remove screws to access it.
- Step 4: Remove any expansion cards from the PCIe slots to prevent interference with the graphics driver installation.
- Step 5: Insert the graphics driver CD or DVD into the PC's optical drive and run the installation program.
- Step 6: Follow the on-screen instructions to complete the installation. Save any unsaved work and restart the PC.
Method 3: Power Supply Unit (PSU) Replacement
- Step 1: Disconnect the power cord from the back of the PC and unplug any other cables.
- Step 2: Open the case and locate the PSU. It's usually a rectangular box with connectors attached to it.
- Step 3: Carefully disconnect the PSU cables from the motherboard, CPU power supply, and any other components that require power.
- Step 4: Remove the PSU from its mounting bracket and replace it with a new one. Make sure to handle the new PSU by the edges to avoid touching any of the electrical components.
- Step 5: Reconnect the PSU cables to their respective connectors on the motherboard, CPU power supply, and other components that require power.
- Step 6: Reconnect the power cord and plug in any other cables. Enter the BIOS settings by pressing F2 during boot-up. Save the changes and exit the BIOS.
💡 Conclusion
If none of the above methods work, it's possible that there's a hardware issue with the PC. In this case, consider seeking professional help from a qualified technician or purchasing a new PC.
❓ Frequently Asked Questions
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