The most reported problem is a dead board that does nothing when the power button is pressed. On an OptiPlex 780 board, for instance, a common cause for a no-boot scenario is the absence of Vcore (CPU core voltage). Technicians report that checking the main power supply's "Power OK" signal and the Vcore generation circuitry is the first step. A comprehensive guide to this common issue is part of the updated resources for the GA0403 model.
Disclaimer: Repairing electronics involves risks. Always ensure the motherboard is disconnected from all power sources before testing.
The most frequent story surrounding this motherboard is a user reporting, "It was working fine, I shut it down, and now it won't turn on. The power button doesn't light up, or it flashes amber."
