My Compaq Presario C700 shuts down at randomly and there is no noise coming from the machine at all

My laptop will only turn on for about ten minutes before dying, it doesn't even go through the usual shut down process, it just turns off. Also, there is no sound of a fan or any humming coming from the computer. Before this problem of the random shutting down started, there was always a humming sound coming out. This happened to the computer about a year ago, and I gave it into PC World (Ireland) and they wiped the system and it worked again. So, the minute I saw the same thing happening I backed everything up and wiped it myself, I set up my user in vista again, but the computer was the same and was turning off randomly.
Does anyone know how this can be fixed?? Thanks for your help.
PS: It's A HP Compaq Presario C700 Series Notebook running Windows Vista Home Premium.

There may be a real hardware issue (like spanning above mentioned.) When I lose sound on my phone, here are the things I try, in no particular order:
If you use Apple TV, open a movie file (you tube, music video, anything you can play over Apple TV.) Switch to Apple TV playout and then switch back to your phone. If you left the phone going out to Apple TV, it may have kept the sound routing there -- switching back and forth again should reset it back to playing to your iPhone speakers.
If you use headphones, stick the headphones in and out again. Same kind of idea, the headphone detection may have been incorrect, and the toggle in & out will help it reset back to your speakers.
If you play games, go into a game with sound and adjust the volume there. There are actually three different volume settings (as far as I have experimented with) ringer, "normal" volume, and game volume... it's a little buggy figuring out which one your phone should be using

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