Please do not die on me

I am having trouble with my 2-year old laptop. It starts to manifest problems such as frequent hanging and too low sound volume.
I have asked my neighbor to tinker with it and diagnose the problem but he failed. I also have updated my operating system but to no avail. I am now left with the option to bring it to the service center but I was advised to get a data backup just so there is a need to reformat the entire system. I wish it can still be revived. As much as I wanted to get a new laptop, I am not yet ready to get a new one.