URGENT! Can't boot computer, "Operation System Not Found" error!?!?

[sunnysky]

My computer had been working perfectly until now. I carried it in my backpack for a little bit, and when I tried turning it on at home, a black screen came up saying "Operation System Not Found." What's wrong??

I hardly know anything about fixing computers. I obviously didn't meddle with the operating system or whatever. I really don't know what's wrong.

I remember you're supposed to press the F2 key. I did, and a screen came up that's titled "Insyde H2O Setup Utility Bios Version R029Q2." I have no idea what that's about so I didn't do anything else.

I'm using a Sony VAIO laptop with Windows Vista.

Please help!

 

[sunnysky]

Solved! Someone told me to reseat the HD so I just opened the HD compartment in the back. The drive was loose! It wasn't even connected to the little metal things inside the computer. No wonder why I couldn't boot up my computer. I pushed the drive back into its original position and now everything's working fine. =D

 

[Kitsune]

For future reference if it does that and the HDD is plugged in, it usually means there are some errors with the harddrive causing it not to read or the harddrive is on its way out. Meaning it is going to die.