Win7 system computer boot CPU fan turn and stop what to do

1, check the host power supply is working

Does the power supply fan rotate? Hand to the main chassis of the back of the switch power supply outlet, feel the wind blowing out the normal power supply, no wind is a power failure; host power switch on the instant keyboard three lights (NumLock, CapsLock, scrolllock) whether shiny? Yes, The power supply is normal, the power supply light on the host panel, the hard drive light is on. Because the power supply is not normal or the motherboard is not powered on, the monitor does not receive a data signal and is clearly not displayed.

2. Check whether the monitor is power-added

is the power switch on the monitor turned on? Is the monitor's power led lit? is the display's brightness potentiometer closed to the minimum? Is there a "hissing" sound on the back of the hand to the display screen?

3, check the display card and monitor signal line contact is good

Can unplug the plug to check, D-shaped socket is bent, broken needle, there is a lot of dirt, this is a lot of users often encounter problems. In connection with the D-shaped socket, due to uneven force, or forget to tighten the socket fixing screws, so that the socket contact is bad, or due to improper installation method of the Ambassador D-shaped socket pin or bent, so that contact bad.

4, open the chassis check whether the card is properly installed, and the motherboard slot is good contact

Does the display card or slot have too much dust to be used for too long, resulting in poor contact? Does the chip on the card display a burnt or cracked mark? When a black screen is caused by a display card, the computer post will have a short, four-length beep beep. Try another good video card.

5, check the other board card and the slot contact with the motherboard is good

Pay attention to check the hard drive data cable, power cord connection is correct? Replace other card slots and clean pins. This is a point that many people tend to overlook easily. In fact, because the sound card and other equipment installation is not correct, resulting in the system initialization difficult to complete, especially the hard disk data line, power line plug wrong, but also easy to cause the failure of the display.

6, check the memory of the board and the contact is good, the quality of the memory bar is perfect

Reseat the memory strips once, or replace the new memory strips. If there is a problem with the memory bar, the computer will start with a continuous tone "beep" sound.