How to Fix: Pc won’t boot and is says no signal unless cmos is reset and it only goes t
Pc won't boot and shows no signal, but boots up when CMOS is reset and only goes to BIOS with F1 or F10. Try replacing the motherboard or checking for loose connections.
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.
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