Here below are possible causes and troubleshooting steps of laptop that can't power on, hope it may help:
Possible causes:
1. AC adapter failure.
2. Power jack failure.
3. Motherboard failure.
Possible troubleshooting steps and repair solutions:
1. Test the AC adapter with a digital multimeter. It's possible that you have a failed AC adapter. If you don't have a multimeter, test your laptop with another known good AC adapter.
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.
SOURCE: Gateway laptop Model No. NEW95 won't charge
If the main battery is not charging properly and you state the charger and battery are fine, then there is only one possibility, the charge circuits on the motherboard are defective, this is a very rare situation and I have seen it once in all the years of service, make sure the battery is not the problem because in most cases it is.
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