Malfunctioning of your PC can be due to diverse reasons. It could be a hardware problem, or the reason could also be a malware. The most common error messages that you may encounter when you boot your computer are:
• Error Loading Operating System
• Bootmgr is missing
• Operating system not found
• Windows failed to start
• Blue screen of death
• Invalid partition table
• Black Screen and no error message
How To Resolve PC Booting Problems?