New PC Won't Boot up, What Do I Do?

I just put together and built my PC yesterday, and I encountered a problem while starting up. Nothing happened. I can't access the Windows for some reason. I've checked over peripherals and hardware a thousand times, and I'm pretty sure everything is in the right place. Is there anything else I can do to solve this problem? Thanks!

Since you have already checked the peripherals and hardware, and they are working fine, consider the error coming from the inside of the system. It's hard to determine the actual cause of the new PC won't boot up issue. Therefore, I want to recommend a reliable boot repair tool to you.

EaseUS Partition Master is a comprehensive application that includes a powerful feature - Boot Repair. It can automatically detect and repair errors and corruptions in the Windows system with its advanced algorithm.

After downloading this tool, follow the steps here to perform Boot Repair.

Preparations: a USB drive, an accessible computer

Step 1. Launch EaseUS Partition Master after connecting the USB to the accessible computer.

Step 2. Go to "Bootable Media" and hit "Create bootable media" to make your USB bootable.

Step 3. Connect the created bootable USB drive to your new PC and reboot from the USB drive.

Step 4. Launch EaseUS Partition Master and go to "Toolkit" > "Boot Repair" to repair your system.