First of all, let's get into the basics. What is the BIOS and why should you flash it? Let me explain. It's the acronym for Basic Input/Output System. It's one of the most crucial components on a motherboard. It determines and tells your computer what it can do without accessing any other files or programs from your storage; it acts like simple software. This includes how to control your keyboard, communicate with your processor, send/receive video signals to/from your monitor, and recognize your components (hard drives, optical drives, USB devices, serial ports and so on). If this makes sense then you understand that without the BIOS a computer would not boot at all (no POST); neither will it boot with a defective/corrupted BIOS.