My Acer 5630, suddenly cannot turn on. I already replace DC power adapter by a new one, but the problem still exist. Anybody can help me.

If you already tried the classic solutions with presing the power button for 20-30sec after you removed the battery and the charger, and no succes then try that:
http://www.fixya.com/support/t4270312-acer_extensa_5630ez_won_t_turn

Possible cause:
1. AC adapter failure.
2. Power jack failure.
3. Motherboard failure.
Possible troubleshooting steps and repair solution:
1. Since the problem had not gone even with a new power adapter, you could exclude the possibility of ac adapter failure. 2. It's possible that power jack (socket where you plug the AC adapter) is broken. Remove the motherboard and take a closer look at the power jack. In some cases you can fix the jack by resoldering it on the motherboard. In other cases you have to replace the jack with a new one.
Using a multimeter, test if the power goes to the motherboard through the jack.
3. If replacing the AC power adapter and jack on the motherboard doesn't help, most likely you have a bad motherboard. Replace the motherboard.

If you have already changed the charger, and tried running it without the battery, it sounds like you have a Mother Board failure. You should contact Acer and have it replaced.