MISFORTUNE-Crash of my desktop

1. Finished modelling 3 cross sections of RC beams (2 hours at afternoon);
2. My SAMSUNG monitor shut down automatically when I was modelling the 4th cross section. But I can still hear the sound of harddisk;
3. I restart the computer, the monitor still did not work. I guss it's due to the three possibilities: Crash of monitor (low possibility), Crash of motherboard (high), Crash of powersupply (high);
4. Unfortunately, I lost all of my works during these two days!!