Question Black screen

Dec 13, 2018
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Components: AMD phenom II black edition (processor), AMD ATI Radeon HD 6670 (g card), Cooler Master Glite (cabinet), WD 1tb (HDD), ASUS M4A88T-M (mb)

Problem: I was watching a movie. After 15 minutes, screen went black ( light is not emitting from the screen, and the monitor power light is blinking). Machine restarted automatically, heard the beep sound (as usual), HDD light on the cabinet is blinking properly, fans are on, but nothing on the screen (not even BIOS). Monitor power light is blinking again.
3 days earlier same thing happened, machine took a restart when the screen and the audio crashed (it happened when i was watching a movie using VLC media player). But after the restart everything was working fine.
What can possibly go wrong? My HDD is new as the old one was not working properly.
 
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