Power faults
Computer Won't Turn On?
Total system silence, cycling power LEDs, or a dark black screen? Use this hardware checklist to identify power rail shorts, bad charger negotiation, or failed PSU components.
Checkpoint 1
Power Rail Delivery & Charging Negotiation
Faulty USB-C PD chips, damaged AC adapters, or cracked center pins inside DC barrel jacks often prevent current from entering the system. If no LED flashes when plugging in the adapter, the system is not receiving standby voltage.
Checkpoint 2
Depleted or Swollen Battery Interlock
When lithium cells experience internal shorts or reach zero millivolts, the embedded Battery Management System (BMS) intentionally cuts power delivery to prevent thermal runaway.
Checkpoint 3
POST Failure / Bad Memory (RAM) Seating
If the cooling fan spins or keyboard backlighting activates, but the screen stays entirely dark, the motherboard is halting during the Power-On Self-Test (POST). Oxidation across SODIMM RAM gold fingers is a frequent cause.
On-site visits across East Sussex
RoamTech comes to your home or workplace across Hastings, Bexhill, St Leonards, and Eastbourne. If the fault cannot be fixed, you do not pay a labour charge.