A user has reported difficulties while assembling a new desktop computer with components that have previously been used successfully. The build includes a Seasonic Focus GX-750 PSU, an ASUS PRIME Z890-P WIFI motherboard, and an Intel Core Ultra 7 265k CPU, alongside 64 GB of Crucial DDR5 5600 RAM. After troubleshooting various scenarios, the user found the system completely unresponsive, with no fans spinning and no lights illuminating, indicating a failure to power on at all. The user had even tested the power supply separately and confirmed it was functioning correctly with a provided tester. In attempts to isolate the problem, the user employed a method where the micro ATX motherboard was placed outside of the case to eliminate potential grounding issues. They also tried shorting the start pins with a screwdriver and utilized different electrical outlets within their apartment. Despite these measures, all efforts to get any form of reaction from the computer went unsuccessful. The situation has led to rising frustration, as the user has experience in building computers and expected these compatible parts to operate seamlessly together. The user's struggle highlights a common issue in computing where new components initially seem functional but may fail to work together in certain configurations. Even when each component has individually tested correctly, unforeseen issues such as shorts, defective parts, or connectivity problems can prevent the system from powering on. Therefore, this case serves as a reminder that the assembly of computer systems often requires meticulous checking and sometimes the necessity to replace parts even after verification of their functionality. As such, the user has been prompted to seek advice to troubleshoot further. The importance of careful assembly and the need for patience in tackling unexpected obstacles when building a computer cannot be understated. While this experience is unfortunate, it can serve as a learning opportunity for both the user and those following similar paths in computer assembly.