Sometimes the laptop suddenly can not start, and this time do not worry, a good check is what causes, and then make the appropriate treatment.
Check the notebook power adapter wire and all plugs are firmly seated in their respective sockets, If not, poor contact with the power plug and then press down press like.
Check the battery interface and power cord if there is dirt, and then power, if any, is due to the dirt makes a power-on resistance, take out the battery or disconnect the plug, wipe with a clean cloth.
Laptop battery and external power cord for power supply. Boot, testing power indicator is lit, and then to determine what is the problem of the battery or external power supply.
If you are not using AC power and the battery is too low may prevent the computer, insert the AC power or to charge the battery and try again.