You just got off work and decide to relax with some video games when suddenly your PC won't boot. When you power it on, you see the message "No OS found on bootable disks." Which of the following actions is the MOST likely to resolve the problem?
Run diskpart to extend the boot partition
Run chkdsk to scan the file system
Repair the MBR
Reboot the computer and see if the error disappears
Because this is an existing system and the operating system files themselves are probably still present, the most common cause of the message is a damaged boot record or partition table. Rebuilding the Master Boot Record (MBR)-or the corresponding boot data on a GUID Partition Table (GPT) disk-restores the information that the firmware uses to locate and start the OS boot loader. Rebooting rarely fixes a corrupted boot sector, resizing partitions with diskpart will not repair boot code, and chkdsk targets file-system errors rather than boot-sector corruption.
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What is the Master Boot Record (MBR)?
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What is a Globally Unique ID Partition Table (GPT)?