Press all buttons on your keyboard until it comes back. :devroll:
I had the same problem. I did that, PC started task manager or something and suddenly I saw somethinglike, are you ssure you wish to terminate or something so I was smashing the buttons and I hit enter.
PC suddenly restarted and went into some blue screen and showed a bar. The title said formatting hard drive. I quickly restarted my PC and then it says Hard Drive corrupt and tells me some instructions and causes. It says it was because of interrupting the formatting.
I opened the PC and took the HD out. Then I put it back in but that didn't work. I did it again, and I accidentally plugged it into the wrong port. So first I saw the simple bios saying no HD detected then I smelled smoke and saw my motherboard was on fire. I quickly took the bottle of water near me and emptied it on it. But instead of the fire extinguishing I saw electricity sparks and the whole PC was on fire now. I quickly ran out and turned the electricity main switch off. Then it stopped the electricity and I threw water to extinguish the flames.
Here's a picture of my PC:

Im using my phone to post this. You owe me $500-700 for a new PC. I'm waiting for your forum PM now.
Post Merge: May 05, 2013, 10:17:23 am
nothing works still same problem cant see the chat also i tried to reinstall ...
Whatever you do, don't press all the keys just like that.