Installing Windows NT on the '90s Mystery PC but Everything Goes Wrong...

Summary of technological concepts, product features, and troubleshooting (from the subtitles)

Revisiting a “’90s mystery PC” build (Windows 98 era)

• The video resumes work on a custom-built 1990s system that has been:
  • Physically and electrically unreliable
  • Affected by a power supply failure
  • Missing or damaged front panel components, including a broken front panel / CD drive faceplate

Power supply replacement + AT vs ATX compatibility

• The system uses an older AT-style motherboard, which differs from ATX in:
  • Connector type
  • Power switching behavior
• The creator replaces the system’s power supply with a modern ATX PSU and uses a custom ATX-to-AT adapter so the ATX supply can operate in an AT system.
• The host rewires the physical power switch wiring:
  • In older AT systems, the external switch could route AC 110V through the switch for DC conversion.
  • After ATX conversion, the external switch no longer routes AC for DC conversion.
  • With the adapter, the external switch effectively becomes a “glorified paper clip.”
• ATX “turn-on” behavior is achieved by jumping PSU control lines, with the noted reference being green wire to black wire (PSU control signal to ground).

Power-on failures due to power distribution / wattage constraints

• Even after the switch wiring change, the system initially does not fully power on.
• Troubleshooting includes unplugging various devices from Molex connectors:
  • With only the motherboard/CPU fan connected, the system powers successfully.
• Key insight:
  • The “replacement” PSU mentioned (e.g., 250W, 300W) still cannot provide enough power for the full load.
• Resolution:
  • A significantly higher-wattage PSU (around ~485W) is required from another system to power reliably:
    • Motherboard
    • HDD
    • CD drive
    • Tape drive
    • Floppy drive
    • Etc.
• The video frames this as surprising for a mid-’90s machine, but it reflects real-world constraints such as:
  • Power rail capacity
  • Load handling
  • Adapter limitations

Hard drive failure and Windows 98 bad sector recovery attempts

• Booting Windows 98 triggers SCANDISK errors indicating:
  • Bad sectors
  • Cluster read failures
• During surface scanning, progress stalls around ~32%, suggesting:
  • Mechanical issues and/or
  • Failing media
• The creator considers whether to wipe sensitive data found on the drive (e.g., QuickBooks data) and decides to wipe for privacy/security.

Using a bootable diagnostic environment (Hiren’s BootCD)

• To avoid wiping without evidence, the creator uses Hiren’s BootCD to run disk diagnostics:
  • References Hard Disk Diagnostic version 2.10
  • Mentions tools available via the CD’s diagnostic menu (e.g., “Bart’s” tools)
• Diagnostic interpretation:
  • Some tests (read/seek/head select/ECC checks) show partial pass results.
  • ECC test fails, and head-related tests indicate issues consistent with drive degradation.
• Conclusion:
  • The goal is not recovery
  • The drive should be replaced

Drive replacement complication: SATA-to-IDE / adapter usage

• Replacement plan:
  • A Seagate Barracuda 40GB SATA drive
• Because the vintage system expects IDE, the creator uses a SATA-to-IDE adapter.
• The adapter is treated as a temporary fix to proceed with installation tasks.
• Outcomes:
  • The new drive is detected successfully
  • Further installation steps encounter formatting/setup problems

BIOS/boot order management

• The creator edits BIOS boot sequence settings to prioritize CD-ROM so the system can boot diagnostic/installation discs.
• Specific “Boot Sequence” options are mentioned in the BIOS menu context.
• The setup may not persist due to concerns around:
  • BIOS battery (mentioned as a suspicion)

Windows NT 4 / FAT-NTFS partitioning workflow attempts

• The creator’s goal includes installing Windows NT (likely NT 4).
• Attempted workflow:
  • Create/prepare partitions in DOS using Fdisk and format
  • Use NT/installer support for large drives and NTFS-capable setup
• Issues encountered:
  • Format/partitioning commands terminate unexpectedly
  • “Setup cannot find required files” / “invalid system disc”-type flow confusion
  • NTFS formatting fails due to partition size limitations (“partition too large”)
• Workaround:
  • Create a smaller NTFS partition (around ~200MB) to satisfy NT/installer constraints
• The video ends early due to time/fatigue, leaving the NT installation unfinished

Peripheral/drive issues noted beyond the hard drive

• Floppy drive inconsistencies
  • The Windows ME setup disc could not boot cleanly as expected after boot/config changes
• CD drive verification
  • The CD drive is confirmed working after:
    • Adjusting BIOS boot order
    • Using the diagnostic disc

Side note: recording/camera file corruption

• The creator reports video file corruption after copying from an iPhone.
• Fix attempts include using an AirPlay server + screen capture to preserve footage.

Sponsorship

• Leno (Linux-based virtual machines) is mentioned as a cloud-hosting option:
  • Pricing example: starting at $5/month
  • Includes a link offering a free $100 credit (as described in the subtitles)

Main speakers / sources

• Main speaker/source:
  • The video’s primary creator/host (narrates and performs the build/troubleshooting throughout)
• Tools referenced as sources:
  • SCANDISK
  • Hiren’s BootCD
  • Hard Disk Diagnostic 2.10 (diagnostic environment/tests from boot media)