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My laptop doesn’t charge when I plug in the power adapter.
Your charging problem is most likely a result of a faulty battery, a broken charger, or internal component errors. Take a look at this troubleshooting page for more information: Asus G74SX-BBK7 Troubleshooting.
every Laptop battery has life cycles around 500-1000 : (depend on the manufacture and battery chemistry ) check on clicking the battery icon where at system tray, if you use windows 7 or later you may see that windows suggesting you to replace the battery.
Can you please let me know what this could be https://youtu.be/rQQNp1E2EvM
