Employees of service centers are often asked the question of why the monitor does not turn on. Most often, the situation is as follows: a person presses the power button on the system unit, the cooling system fans begin to work, and the monitor screen remains black.
In addition to everything, the operation indicator
LED may
blink , as if in standby mode. In such a situation, one does not have to panic and, having built a chain of logical conclusions “the monitor does not turn on - it means it is broken”, carry it to the workshop for repair under warranty. The workshop will not go anywhere, but blushing before the workers, observing with their own eyes how the “broken” monitor turns on wonderfully with another computer, may be necessary. You must first check everything yourself and only then decide what to do next.
If the monitor does not turn on, then one of the most likely causes is a problem on the “motherboard - video card - image output device” section. They should be checked first. Every computer owner knows that when you turn on the power, his silicon friend emits a joyful squeak from the internal speaker. This sound symbolizes the successful completion of all self-tests. Its absence may indicate a malfunction of the motherboard or central processor. But if instead of one “beep” a series of intermittent sounds is produced, then this indicates problems with other components - memory, controllers, and a video card.
“Symptoms”, when the monitor does not turn on and “beep-beep ...” sound, are highly likely to indicate a problem with the video adapter. It is necessary to turn off the power, remove the system unit cover, unscrew the monitor cable from the card connector, unscrew the fixing screw and carefully remove it from the connector. Then, with a clerical grater, clean the comb of copper contacts on it and collect in the reverse sequence. Particular attention should be paid to the uniformity of the entry of the sliding contacts into the connector, since the problem of “the monitor does not turn on” is sometimes caused by a violation of their contact.
But if the squeak is heard as usual when turned on, but the screen does not display anything, then the range of possible reasons narrows. It is possible that the video adapter unit responsible for transmitting the image has failed. And since the processor itself is operational, the self-test is successful.
In this case, you will have to check the monitor with another card (on another computer). But before that, you should do the following:
- make sure that the card-monitor cable is not damaged anywhere, and that the connectors are fixed securely with the provided screws;
- The monitor LED is on. If it does not light, then you need to check the power supply (plug, power cord) and turn it on by pressing the button. The indication itself very rarely fails.
And the last problem, which, although it seems funny, causes a flurry of calls to the masters. The fact is that almost all modern monitors have several outputs: D-SUB, DVI, HDMI, etc. In the monitor menu, you can select priority. If the “main” and the really connected output do not match, the screen will not show anything.
But when the monitor on the laptop does not turn on, then everything is a little more complicated. You can recommend trying to press a special key combination that turns on the screen on mobile computers.