From a Celeron 900 to a Core 2 Duo:
Foxconn, a major electronics contract manufacturer, produced the ML194V0 as an OEM (Original Equipment Manufacturer) board. It was primarily utilized by major laptop brands, most notably Toshiba, to power their budget-friendly Satellite and C-series notebooks. foxconn ml194v0 laptop motherboard
The board is easily identifiable by the "ML194V0" silkscreen printed directly onto the PCB (Printed Circuit Board), usually located near the RAM slots or the processor socket. From a Celeron 900 to a Core 2
Replace the old 802.11n card with an Intel AX210 or AX200 (Mini PCIe to M.2 adapter required, or find a rare Mini PCIe AX card). You must remove the BIOS whitelist first using a modded BIOS; otherwise, the laptop will reject the card. This is the most reported issue
This is the most reported issue. The laptop powers on (fans spin, LEDs light), but the screen remains black.