In general, both hardware issues and software failures can make an operating system not found, and here we mainly list the following 5: The basic input/output system (BIOS) does not detect the hard disk that installs Windows. As time went on, new versions were developed including NT, 98, 2000, Me, XP, Vista, Windows 7, Windows 8, and the current version Windows 10.Each version also had various updates that changed or improved on the functionality in ways you may not have noticed. 5 Causes That Lead to Operating System Missing. The HP Recovery Manager option is not available in the Windows 10 Recovery Environment on the initial Troubleshoot screen. The BIOS configuration can become incorrect because of power outages, hardware errors or errors made when configuring the BIOS manually. Since this error occurs when BIOS is unable to find the operating system, checking the BIOS settings first is often a good solution. 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 drive is not found or it doesn’t contain the \Windows folder, type dir b: and press Enter. If drive A: is found and a directory is displayed, check for the \Windows folder in the directory. If the MBR is corrupt, the PC will not start. What could cause intermittent "Operating system not found" on boot-up - HP Pavilion dv9815nr Notebook PC, Windows Vista Premium 32 bit, IE9 Primary problem - on boot-up I get a blank black screen with what appears to be a command cursor that just blinks for several minutes until it is replaced by "Operating system not found". When the product was first developed, it was called "Windows 1." If it is there, that is the System Drive. One example is the Microsoft Windows operating system. On the main menu, click System Tests. So I fully recovered my laptop but the operating system got lost from my hard drive. Open HP PC Hardware Diagnostics and run the Extensive Test. The hard disk failed either physically or logically. This issue is exhibited after the operating system is upgraded from Windows 8 to Windows 10. In this case, I think the port replicator is causing the script that runs and points to the boot manager to miss the path. If the system hard disk cannot be recognized by Windows 10, you will discover the Operating System Not Found in Windows 10. Method 1: Check the BIOS Settings. That message usually indicates the boot manager has lost the OS. Skip to step 2. Try to disconnecting any drives that don't contain an operating system. The Windows Operating System Disc (OSD) provided with your HP notebook PC can be used to repair the Master Boot Record (MBR). The only options available are … Follow the steps below carefully to repair the MBR. My laptop crashed and dit not operate any more. If Intel Optane is listed, the computer has Intel Optane memory … From the Command Prompt, type dir a: and press Enter. If this app is not on your computer, download the latest version from the HP Hardware Diagnostics website. If Intel Optane is not listed, the computer does not have Optane memory or Optane is malfunctioning and cannot be detected. I would check the BIOS setup menu to see what is listed as the first boot device when the laptop is inserted in the port replicator. Cause 1: Bad BIOS configuration. Check the BIOS settings to make sure the BIOS whether detect the hard disk or not, then determine if the hard disk is damaged. In Windows, search for and open the HP PC Hardware Diagnostics for Windows app. Contact HP Customer Support for further assistance . When I start te laptop, I get the message: An operating system wasn't found.