My Dell Inspiration laptop not started so I try the below mentioned but problem not resolves:
1. Connect the AC adapter to a known good power outlet. Check Power LED indicator on AC Adapter with/without plugging into the Notebook.
2. If LED on the AC Adapter goes off only after connecting to notebook, the issue is with the motherboard.
3. If the AC Adapter LED is ON, then remove external peripherals, battery, AC Adapter and press and hold the power button for 10-15 seconds to drain Flea power.
4. Plug in the AC Adapter and battery and check if the computer powers on.
Do reply with results.
Does the LED keep staying on after connecting the cable? In general, this may be a power related issue or a motherboard issue. You have done pretty good job trying to troubleshoot the problem, but if none of this helped, you may need to consult a technician. If the laptop is under warranty, contact the seller. Sometimes power ports cause problems but, fortunately, this kind of problem is repairable in most cases.