There is no display when the computer is turned on. The first thing to check is the BIOS. The motherboard's BIOS stores important hardware data. At the same time, the BIOS is also a relatively vulnerable part of the motherboard. It is extremely vulnerable to damage. Once it is damaged, the system will not run. This type of failure is usually caused by the destruction of the motherboard BIOS by the CIH virus. (Of course, it does not rule out that the motherboard itself is faulty and the system cannot run.). Generally, the data in the hard disk will be completely lost after the BIOS is destroyed by the virus. Therefore, it can be judged whether the BIOS is damaged by detecting whether the data of the hard disk is intact. If the data of the hard disk is intact, there are three reasons for the booting without display:
1. Because there is a problem with the motherboard expansion slot or expansion card, the motherboard does not respond and does not display after plugging in an expansion card such as a sound card.
2. The jumper-free motherboard has a wrong CPU frequency set in CMOS, which may also cause no display failure. For this, just clear the CMOS to solve it. Clear the CMOS jumper is generally near the lithium battery of the motherboard, its default position is generally 1, 2 short circuit, as long as it is changed to 2, 3 short circuit for a few seconds to solve the problem, for the old motherboard if the user can not find To the jumper, just remove the battery, wait until the boot display enters the CMOS settings, then turn it off, and the battery will also go up to the CMOS discharge.
3. If the motherboard does not recognize the memory, the memory is damaged, or the memory does not match, it will cause the display to fail without booting. Some old motherboards are more picky memory. Once plugged in memory that the motherboard does not recognize, the motherboard will not boot, and even some motherboards will not give you any fault prompts (tweets). Of course, sometimes in order to expand the memory to improve system performance, the result is that plugging in different brands and types of memory will also lead to such failures, so you should pay more attention when overhauling.
For the failure of the motherboard BIOS to be destroyed, you can plug in the ISA graphics card to see if there is any display (if prompted, you can follow the prompt steps.) If there is no boot screen, you can make a floppy disk that automatically updates the BIOS. Flash BIOS, but some motherboard BIOS is destroyed, the floppy drive does not work at all, at this time, you can try to solve it with hot plug method (I have tried, as long as the BIOS is the same, can be successfully burned in the same level of the motherboard) record.). However, the use of hot-swap in addition to the need for the same BIOS may also cause damage to some components of the motherboard, so a reliable method is to use the code writer to write the BIOS update file to the BIOS (you can find a computer with this service to solve the problem).