If your Dell XPS laptop intermittently stops charging, shows errors like “AC power adapter wattage and type cannot be determined”, or only charges after repeated unplugging, rebooting, or disconnecting the battery, you’re not alone.
Many Dell XPS owners in the UK initially assume this is a faulty charger or battery. In reality, as this case clearly demonstrates, the root cause often lies on the motherboard, specifically within the charging circuit.
This article explains the symptoms, the troubleshooting already done, what those signs actually mean, and when a motherboard-level repair or replacement becomes unavoidable.
In this real-world case, the issue presented intermittently and unpredictably:
This cycle may repeat days or weeks later.
This is important, all standard causes were ruled out:
At this stage, charger-related issues are effectively eliminated.
Two key facts point away from the charger:
If the charger, battery, or DC port were truly faulty, the problem would be consistent, not intermittent.
The Dell BIOS warning
“AC power adapter wattage and type cannot be determined”
is a major clue.
This message usually indicates a failure in the adapter identification signal path. Dell chargers use a dedicated communication line to tell the motherboard:
When this signal becomes unstable, the system:
The DC-in port is the most common failure point, so replacing it was the right move.
However, once the port is confirmed good, the remaining suspects are on the motherboard:
On 5-year-old Dell XPS models, these components often degrade due to:
Dell diagnostics are useful, but limited.
In this case:
That’s normal.
Motherboard charging faults are often intermittent analogue failures, which:
Diagnostics not showing a clear failure does not rule out a motherboard issue.
This Dell XPS charging issue is a classic motherboard charging circuit failure, not a charger or battery fault. The intermittent behaviour, BIOS warnings, and temporary fixes after battery reseating are all textbook signs.
If your laptop is stuck in this loop, you’re not imagining it, and you’re not alone.
We specialise in advanced Dell laptop faults, from charging issues to motherboard-level repairs, carried out at your home or office.
Aamir Mehmood is a Senior IT Consultant & Technology Writer with over 15+ years of experience and one of the founders of Geeks Callout, an award-winning London-based IT support company specialising in PC, MacBook, and gaming repairs. He is recognised for delivering reliable, customer-focused IT solutions. Under his leadership, Geeks Callout has won multiple honours, including the 2023 Business Excellence Award and the 2025 SME UK Enterprise Award. Aamir also writes insightful articles to simplify complex technology, making him a trusted voice in London’s IT community.
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