To elaborate, I unscrewed the bottom part of the laptop as well as the fans (didn't disconnect them) and used canned air to get the dust out; I checked, and the thermal paste looked OK. I didn't do a booting test at the moment, unfortunately. Afterwards, I screwed everything back into place and decided to test it.
The keyboard lights and power lights on the side turned on, albeit with no display or the usual fan noises when turning on a PC. After letting it run for a while, it started to heat up and the fans became louder, until they stopped spinning, only to repeat the cycle again.
I think it doesn't boot because some water may have had dropped from the canned air's can, and into the computer, but no idea where or when. In any case, any help or suggestions would be appreciated.
//Edited the content to add model name.