CentOS 7 Boot Failure Repair

My on-premise CentOS 7 machine, running on bare-metal hardware, will no longer complete the boot sequence. I can stand in front of the box, hook up a console, mount external media—whatever you need me to do on site—so you will have full hands-on assistance from me while you guide the recovery... (Budget: ₹600 - ₹1500 INR, Jobs: Documentation, Linux, Shell Script, System Admin, System Administration, Technical Support, Troubleshooting, Ubuntu)