After restarting the computer, hold the "F8" key as the computer reboots and navigate through "advanced boot options" to "command prompt," then use the commands "bootrec /fixmbr," "bootrec /fixboot" or "bootrec /RebuildBcd" to fix an invalid partition table. This process may vary depending on which type of computer and operating system is not working properly.Continue Reading
An invalid partition table means that the startup drive for a computer is not working properly. If the problem cannot be fixed using commands, then the drive might be broken beyond repair.
Remove any external drives that may be connected to the computer and shut the computer off.
Restart the computer and hold down the "F8" key. A menu screen should appear. Click on "Repair Your Computer," then select the correct keyboard type and log in with an administrator's password. From here, click on "Command Prompt."
First, type "bootrec /fixmbr" and wait. If the computer is not fixed after restarting it, repeat the above steps and instead type "bootrec /fixboot." If that does not fix the computer upon restarting, then repeat the above steps and instead type "bootrec /RebuildBcd." If none of these commands work, the computer should be taken in to a computer repair shop to make sure the drive is not broken beyond repair.