My computer can't work normally now. A few days ago, I logged in my PC and enterred the desktop, the blue screen suddenly happened. I tried to restart the PC several times, but I failed. I enterred the safe mode and scanned the system, the result reported that the PC was safe. I tried to pull out the memory stick and used an eraser to clear the connecting finger. However, it didn't work as well. I even took apart my PC and cleared the computer fan. What the hell should I do now?