Just a Black Screen

It appears you were hoping some simple fix was involved but it was more. Depending on your capabilities it will get involved on a teardown. Many laptops aren't just screwed held together it maybe more than that. I strongly suggest you google for possible YouTube or similar instructions on that model laptop teardown -OR- some Gateway model to get an idea what's involved and good tools for the task.

There may have been some s/w fault why your mouse didn't work. But then also h/w based as well. The area of the mouse usually is top serviced, not the bottom but you may have to remove numeral screws to release the top cover and/or access. MOST laptops to start the top side cover removal require you to release(untab, maybe screws) the cover immediately above the top row of keys. That cover(if no screws) is held in place by small tabs that recess into groves/holes. You need to pry using a metal shim or flat metal to help in this process with deft care. Once off, some screws them hold down the whole keybd. or main section and etc., and repeat process that's presented to you. Do this at your own risk, but at 4mos. of use, that's some warranty issue, why not use it, because your fiddling is bound to void it, your decision.

tada -----Willy

As far as I understand you just see a black screen the whole time. Does it post? Do you see any letters when it starts?
Have you tried to connect it to another monitor?

I have seen a lot of similar problems with laptops. Most of the time, it is the motherboard that is the issue.
If the motherboard is failing, you would get the problems you described: freezes, keyboard not working, no video.

Sometimes it is a defective display or backlight. But you can rule it out by testing it with a separate monitor.
So if you see absolutely nothing when you turn it on, it is less likely to be other hardware, because you would generally at least see it posting during boot.

by taking it apart? If it needs new parts you'll probably have to order them and wait for them anyway . Do you even know how to test those parts? Take it back where you purchased it and have them exchange it for another or repair it under warranty.

in sort of "out of the way" place there near Himalayas, have you considered something easier to use and work on like a desktop? Heck, you could use the 4 screw holes in back of an LCD to attach it to the side of a mid tower and then fit a handle on top middle made from a leather belt.

LOL, I actually did something like that to a small 13" TV I gave my daughters years ago when they were little, by drilling and installing a piece from an old leather belt as handle on top of the TV so they could move it easier with less chance of dropping it. Made it convenient for carry when on road trips with the family while plugged to a power convertor in the van too, along with a VCR, so they could watch movies and quit asking "when will we get there?" It's gone now, sometime years ago in a yard sale. It got a chuckle and then the guy just HAD to buy it.