![]() ![]() It’s helpful to keep the manual or guide open on a second device, such as a laptop or smartphone. There may also be a guide on the BIOS tab of the product page. A BIOS or UEFI chapter should explain several ways to “flash” - or update - the BIOS. Once you have the product model, navigate to the manufacturer’s product support page and look for the product manual. Recovery might require a prepared USB stick or CD as well as keyboard activation of a recovery tool built into a prebuilt PC. The BIOS already has the interrupts for the working components like stated above so it does not need the CPU to process anything in order to send a signal using the motherboard to produce a beep or flashing light, or in your case the video card to display a message.Note: Before proceeding further, back up your personal files and research recovery options for your PC and motherboard in the case of BIOS corruption. The BIOS has the ability to run just the most basic initialization sequence, and in some cases relay just the most basic of error codes. It usually doesn't show the error on the monitor like in your case (because what if the video card is the problem). Many of the errors that I have seen are beeps, or flashing LEDs that have to be looked up for their meaning. The BIOS has initial control of the devices so it can check and display errors if needed. Here is a more detailed list of what is happening: boot details This is a simplified version of what is happening for brevity. If all the components properly have interrupts the OS is loaded and the interrupts are passed to the OS so that the OS can interact with the components. ![]() Part of the POST instruction set is to assign an interrupt to the component. When they do not pass the checks, then you get an error such as yours. The BIOS has a checklist (POST) that it goes through to initialize all the parts of the computer. But you'd need to insert a supported CPU first in order to flash it. In many cases, this can be patched with a BIOS upgrade. It's probably just checking the family and stepping IDs from the processor against an internal list of supported CPU types. In whatever case, though, the CPU is providing enough support to the BIOS that it can execute the programs stored in its ROM (including moving bytes in and out of video memory). You didn't mention what CPU/motherboard combo you're using. Perhaps you used a CPU that has a higher TDP (generates more heat) than the motherboard can handle, has more cores than the BIOS knows how to initialize, or possibly doesn't support some power state the BIOS is trying to set. ![]() What happened in your case is that the CPU is electrically compatible with the motherboard and does work, but lacks some low-level feature support that the motherboard depends on. This ROM program is written in x86 assembly language and does require the CPU to execute it. ![]() Once these things check out, however, then the CPU begins execution of the program contained within BIOS ROM that performs some additional higher-level checks (such as whether memory timings work, whether additional firmware for onboard devices can be loaded correctly, etc). This check does not require the CPU, however without the CPU present, you may not even get beep codes, as even that requires some measure of processing (depends on the motherboard). If this simple check doesn't pass, you get a beep code (or possibly an LED display on some motherboards). This is a simple electrical check that all the bus line outputs are connected to the correct inputs. The very first thing your computer does when you power it on is checks that the connections between the CPU and RAM are good. No, the BIOS cannot work without the CPU. ![]()
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