Help! Stuck On Screen! Can't Get Out!

I was on YouTube, then the screen went black and restarted, so the Sony Vaio screen shows up, and now it's stuck on the screen where you would tap f7 to bring up safe mode as well as the other options. The screen is all black and there is a blinking white line that goes down a few inches, then stops. Does anyone kneo what to do?

When I restart again and click f7 or f8 it doesn't bring up any safe mode options. It's just stuck on that screen. Please help!

Here is a picture of the screen except mine is a few inches down

http://tips4pc.com/wp-content/upload...ck-screen2.gif

F2 is literally the only way to get out of the black screen, but it goes to the bios thing, I think. So it's useless

So it does go into BIOS but not Safe Mode or Normal?
Sounds like a system disk or MBR problem.
Do you have a W7 DVD or Repair disk or USB Stick to boot with? If so, do so and check your HDD.