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December 4th, 2025 18:44

XPS 8940, turns on but no signal

turns on but no signal help

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2.5K Posts

December 9th, 2025 13:32

The PSU on the back, what color is the LED?


Power Button, blinks with colors and that would be a clue to the problem.

The XPS 8940 uses blinking amber and white lights on the power button as diagnostic codes for hardware issues, like

2 amber, 1 white (2,1) for CPU problems, 2,3 for no RAM, 2,4 for RAM failure, or 3,2 for video/PCI issues, indicating specific failures. To find your code, observe the pattern (e.g., 2 amber flashes, then 4 white flashes), then check the Dell manual or support site for the corresponding hardware fault and troubleshooting steps like reseating RAM or checking the battery. 

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