Hello, I have a Sony vaio PCG-71312L for around 2 years. After trying to install a program it freezed and didn't answer any commands, so i shutdown it by pressing the power button. When i tried to boot it, it went past "start" window to black screen only with mouse on it. I can turn on caps lock and num lock. I've tried loading default settings in BIOS, I've tried removing battery, removing and replacing RAMs, I've tried recovering after pressing F8 button, restoring it to last successful boot. After all this it's still black screen with mouse on it, did anyone have this problem, could you help me ?