You can't film the display with your camera phone and watch the record and pause for each code in order to write it down?
The manual could contain some error codes that could give you some help. Were you playing when the computer froze and siezed to start up? Did you play anything heavy risking to overheat your GPU resulting in this freeze/crash?
Or did you tamper with OS files?
As long as you were not tampering with any hardware it is quite hard to tell why you wouldn't get any picture. RAM is known for beeing faulty as example when not recieving picture but RAM doesn't die just like that.
Is the CPU fan running and is it attatched to CPU? If it all of a sudden is lose/doesn't sit as tight as it should it could be one reason. But atleast you would have picture for a couple of seconds, not for long but before BIOS arrives.
If you could be more specific about what exactly you were doing when the pc froze. What programs and games were you running? How has the temperature been when computer was idle and what temp did you have while gaming, especially the heavier games.
Do you have an embedded GPU in your motherboard? Try plugging your monitor to that port and see if you atleast can get picture.
Is it an AMD GPU or Nvidia?