I have a Sony Vaio S Series Laptop running Windows 7. It's been running well. Then today I started up and got a black screen after the Bios logo screen. Nothing more happened. So I forced shutdown and tried to reboot. I got to the password page and my password wouldn't work. So I tried the previous password (from 6 months ago) and that got me to my desktop, but the system only partially loaded (for example, Yahoo Messenger, which starts up while booting, would not completely load). Most frustrating, however, is that the cursor freezes in the middle of the screen. I tested the mouse, using my other computer, and it works fine.
I have tried booting the computer in every other mode (safe, etc.) many times and I get no farther than with the normal boot.
So I'm locked out and can do nothing. I looked at Command mode but I'm not savvy enuf to know what to do there.