Hello everyone I am new to forum! Well first off I just bought my son his first beginner laptop. It's a ASUS 17" N73s. Win 10, n73su MB. The only problem is it will only charge will the laptop is powered down. If the charger is plugged in whole the laptop is on it kind of flickers back an forth saying chargingx not charging. And the tip of the charger gets super hot. It doesn't get hot while charging when it's off. The charger is a genuine ASUS however the battery is not. It's a 9 cell aftermarket. I have tested charger it measures 19.4 v. Any ideas, thanks in advance for any advice.