The next morning, the power light was on, but the screen was black. No mouse movement or keyboard shortcuts could wake it. Arthur realized he’d fallen into a classic OptiPlex trap: the "Sleep Curse." He spent the next three hours on the Dell Support Site , hunting down the exact Intel Management Engine Chipset drivers to fix the power state transitions.
You can download the full suite of Windows 10 64-bit drivers for the Dell OptiPlex 5040 directly from the official Dell Support site . dell optiplex 5040 drivers for windows 10 64 bit
: You can use the Dell Command | Update tool to automatically scan and install missing drivers . The next morning, the power light was on,