Toshiba Satellite M100 Not Powering Up

Hello all,

Last time working on standby, and then found accidentally shut down and has never started again.

Suspect of overheating issue, as the fan ran strangely about a week before the incidence.

Observations
- Power LED indicator (at the bottom left corner) on when power cord pluged in
- When Power button pushed, it's lighted on for about 9 seconds, and then off. No sound of any hardware or fan working.
- Recharge resolution (Power button held down for a minute or two, while unpluged) has been tried many times. Everthing's the same.

Many thanks in advance to this community.