The BIOS test is a diagnostic tool used by doctors to determine if the computer hardware is running properly by checking the CMOS battery, which powers the real-time clock, date, and other components that make up the BIOS. The test involves observing the lights on the computer's case, and the pattern it shows when running tests can give clues to issues such as overheating, failure to post, and error messages on the monitor, among others.
The BIOS test generally involves pushing the power button to turn on the computer. Then, the BIOS screen appears showing all the settings that are enabled on the motherboard. The test uses a CD or DVD to execute different test routines that check various parts of the BIOS for any errors that may occur. For example, it might check the memory, CPU, and expansion slots and test the keyboard for any damaged keys.
If an error appears during the test, the test will highlight the error by turning the computer case light green and causing the POST beep code to appear. For each error present, the test has a specific result and can help identify which part of the BIOS was not working correctly.
The BIOS test is a critical diagnostic step in identifying and fixing potential computer hardware issues. By checking all the basic components of the BIOS, doctors can quickly determine the cause of the computer's malfunction and take the appropriate corrective measures.