The BIOS update utility froze, and the screen went black. The system emitted a loud, piercing beep, and the motherboard began to emit a bright, blue glow. Alex and Erebus exchanged a nervous glance.

"What's happening?" Erebus asked, his voice barely above a whisper.

Alex chuckled and opened the box, revealing the sleek, black motherboard with a sticker that read "MS14B31 - DO NOT UPDATE BIOS UNLESS AUTHORIZED." He carefully removed the motherboard from its anti-static bag and began to examine it.

It was the spirit of the former BIOS engineer, who had been working on the MS14B31 project when he passed away. He revealed that he had hidden a backdoor in the BIOS, allowing him to access the system from beyond the grave.

Alex's eyes were fixed on the screen as the update progressed. "I don't know, but I think we're experiencing some kind of... glitch."

As he worked, Alex noticed that the motherboard seemed to be emitting a faint, pulsating glow. He shrugged it off as a minor anomaly and proceeded to connect the necessary cables and boot up the system.

As Alex packed up his tools and prepared to leave, Erebus approached him with a curious expression. "You know, Alex," he said, "I think we make a good team. Maybe we should start a detective agency for computer-related mysteries?"