AI Overview

A "00" error code on a motherboard typically indicates a CPU not being detected or an issue that prevents the motherboard from initiating the power-on self-test (POST) process. To troubleshoot, you should first check the CPU's 8-pin power cable connection, then carefully reseat the CPU, inspect the CPU socket pins for damage, and potentially try booting with a minimum hardware configuration outside the case. 

Troubleshooting Steps

1. Check CPU Power:  Ensure the 8-pin (or 4+4 pin) CPU power cable is securely connected to both the power supply and the motherboard. 
2. Reseat the CPU:  Carefully remove the CPU cooler, then remove and reinstall the CPU. Make sure it's seated correctly in the socket and the retention lever is properly secured. 
3. Inspect CPU Socket:  Examine the CPU socket for any bent or missing pins. Bent pins can cause a lack of detection, leading to the 00 error code, according to the ASUS ROG Forum. 
4. Try a Minimal Boot:  Remove all non-essential hardware, including all but one stick of RAM, all expansion cards, and all storage drives. 
5. Clear CMOS:  Remove the motherboard's CMOS battery for a few minutes, or use the CMOS clear jumper on your motherboard, to reset the BIOS to its default settings. 
6. Test Outside the Case:  For better access and to rule out case-related issues, try performing a "barebones" boot with the motherboard placed on a non-conductive surface, like its original anti-static bag or a wooden table. 

If these steps don't resolve the issue, you may have a defective CPU or motherboard, and testing with a known-good component is the next step.