1) First checkyour AC adapter in. If a light turns on, then the AC adapter maybe OK
2) Try to power it on using only the AC adapter, remove the battery...if also cannot power on.
3) Try connect external VGA to Monitor for test.
4) Unplug the system and remove the battery. Hold the power button for 30 seconds. Then try powering up
5) Finally....i think your laptop got Motherboad Failure.
Normally Repair Cost Around RM 200