DISK BOOT FAILURE, INSERT SYSTEM DISK AND PRESS ENTER

[pxt1992]

This is the second time I have had this problem. About a few weeks ago, I had the same problem and we took it to the techies and it got fixed, but this time I need to use the computer today.
I turned the computer on a few minutes ago and it started beeping and this showed up:

"DISK BOOT FAILURE, INSERT SYSTEM DISK AND PRESS ENTER."

So I was wondering if any of you out there would know a solution to this.
Your help will be greatly appreciated.
Thanks

 

[jsc]

Need more information.

However, I'm guessing that what is happening is that the computer cannot find the drive where the operating system files are.