Assuming that the BIOS is able to boot the system far enough to gain access to the video subsystem, it will display information about the PC as it boots. It will also use the video system to communicate error messages to the user. In fact, most boot problems are displayed via video error messages, as opposed to audio beep codes. An error message can be produced by various different parts of the system during the POST process, depending on how far into the boot process the system gets before it is occurs.
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I didn't do anything to the damn thing. It just wants to act all snotty. How can I get it back to normal?
For the stable operation of your computer, all PC components must interact with the software properly. BIOS provides a lot of diagnostic tools that allow you to determine any malfunctions in the constituent parts of the system unit and peripherals, and then notify you about the presence of those malfunctions. It is important to react to such errors on time and in a proper manner, so that your computer will be working as long as possible without serious breakdowns. This is the way for BIOS to reports the detected malfunction during diagnostic procedures when the computer is just starting its operation. As you can guess from the message, the error is connected to the CPU cooler fan.