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HP Notebook PCs - "Missing Operating System" Error Message Appears On Black Screen
HP recommends the following resolutions for "Missing Operating System" or "Operating System Not Found" error messages that may occur before Windows XP or Windows 2000 is started.
Missing Operating System
This error message may appear for one or more of the following reasons:
Use one of the following steps to resolve the error:
Step 1: Test the Hard Drive
Use the steps below to test the hard drive in a Notebook PC using the HP Hard Drive Self Test.
The Hard Drive Self Test will provide an Estimated test time. A Quick test, a Comprehensive test, and a SMART test will execute when the Enter key is pressed.
If any test fails, contact HP service and support for instructions on how to order a replacement hard drive.
If all of the tests pass, the hard drive is not damaged. As a rule, HP will not replace a hard drive under warranty that does not fail the HP Hard Drive Self Test.
NOTE: Many PC problems are related to soft failures on the hard drive. The comprehensive portion of the HP Hard Drive Self Test will repair soft errors on the hard drive, but it will not report the errors. After the test is complete, be sure to restart the PC to see if test repaired the problem you may be experiencing with your PC.
If all the tests pass, press the power button to restart the PC. If the error still occurs proceed to Step 2.
Step 2: Repair the Master Boot Record
The Master Boot Record (MBR) is a section of the hard drive that is used by the PC to start the Windows operating system. If the MBR is corrupt, the PC will not start. The Windows Operating System Disc (OSD) provided with your HP notebook PC can be used to repair the Master Boot Record (MBR). Follow the steps below carefully to repair the MBR.
Step 3: Reinstall the Windows Operating System
To reinstall the Windows XP Operating System on an HP Notebook follow the instructions in the document HP Notebook PCs - Repairing or Reinstalling Windows XP .
Step 4: Contact HP service and support
If steps 1, 2, or 3 do not resolve the error, please contact HP service and support for further assistance.