For all Inspiron Laptop users, prior to starting any game, you should plug the AC adapter in. Then start the game. A mail in service was setup to repair this specific Inspiron G5 SE 5505 technical issues.
I recently purchased a Dell G5SE 15 from best buy to pursue my hobby of Graphic design in a better way. I love to game on the side, and while this laptop isn't great. It's still good. I love being able to play the game I want for an hour without it plugged in, but when I'm super bored and would like to play longer, or I'm streaming I don't have a choice but to power off and let it charger for this particular reason here... Whenever I plug the laptop charger in, the laptops EVERYTHING is boosted drastically, from fps to graphics everything. But, 5 minutes into Gaming on the charger the laptop crashes completely. My guess was overheating so I tried playing with the Dell power manager settings to try and fix it, but still nothing. I play in a generally cool area, on a flat hardwood surface. If there is anyone who can help me I'd be forever thankful. I'm not sure if this is the right forum to post this in, but the Dell G5Se does have some Alienware settings in it's system as well as a control center. From what I've experienced. 
Dell G5 SE 15 Crashes While playing games with the charger plugged in