Mainboard for X3400 M3 / X3500 M3 — Compatible with 81Y6003 81Y6004 69Y0961 69Y3752

Replacement mainboard designed for X3400 M3 and X3500 M3 systems. This board matches OEM part numbers 81Y6003, 81Y6004, 69Y0961 and 69Y3752, making it suitable for direct replacement or repair. Please confirm your system model (X3400 M3 or X3500 M3) and that one of the listed part numbers corresponds to your original motherboard before purchase.