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Fault to its main board. Short circuited component/s at it. Contact any service technician; or the authorized service center. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. http://electronicshelponline.blogspot.com/ . In most cases, the main board might have to be replaced. If so, a software [firmware] update too might be necessary.
remove battery, press and hold power button for 5 seconds, then wait 5 minutes, put battery back in securely and try again. If it powers on, try and look at the power meter to see if it is registering the power supply. You could have faulty memory chip or faulty power supply
I get such a thing from time to time on different systems. What I do:
1. Open the Sound Control Panel (the one on this present PC is named: "SoundMax Control Panel"). 2. Enable or Disable a certain feature (something like "Virtual Theater Surround" or "Virtual Ear" or "Acoustic Environments" or so on). 3. Click Apply and the sound is back in your speakers. 4. If you want, you can undo the enable / disable and the sound still works.