Does the laptop power adapter pull off the mark for a long time?
Short circuit.
Power on, indicating that the power adapter is no problem. A computer lights off, indicating that the motherboard short circuit, that is, the motherboard on the short circuit protection phenomenon, the computer motherboard is broken, it is recommended to go after the sale for the motherboard, the warranty period this thing should not have money.
Extension:
In fact, not only laptop power adapter will be so,
Some mobile phone or tablet computer charger indicator will have the normal phenomenon.
answer:
Laptop power adapter pull the city electricity, had a long time to light off is normal.
Laptop power adapter in a large capacity capacitor, in the switch circuit from the role of energy storage.
When the removal of electricity, the storage capacitor is still within the electricity and through the LED and other original release gradually.
LED indicator (low power consumption) can rely on the large capacitor power supply for a long time, resulting in a long time to light off the phenomenon.
