Security: no small issues, be careful about the damage to system hardware by viruses

CIH virus once put everyone in fear and caused a lot of waves. In the past, various viruses could only damage hard disk data, but CIH could intrude into Flash BIOS on the main board and destroy its content to decommission the main board. The CIH Lesson tells us not to underestimate the damage to hardware caused by viruses. Many people began to worry: will there be more viruses that damage hardware? In fact, analyze it carefully. The "means" of virus damage to hardware is similar to the following:

1. damage the monitor

As we all know, each monitor has its own bandwidth, highest resolution, and field frequency. Early Production of 14 inch color display, bandwidth is only about 35-45 MHz, corresponding to the highest resolution of 1024x768 @ 60Hz field frequency; current 14 inch color display, bandwidth mostly 60 MHz, the maximum resolution is 1024 × 768 @ 75Hz field frequency. The maximum resolution is 15 inch × 110 @ 85Hz field frequency for a 1280 Color Display (high-grade) with a bandwidth of 1024 MHz. You can check the monitor instruction, which includes the field frequency and the highest resolution. If one of them exceeds the upper limit, a screen will appear, and the display will be burned out if it is serious. Viruses can tamper with the display parameters to damage the display (for example, change the resolution and field frequency to the most advanced level supported by the video card ). Although the new type of display has DDC standardization and system connection, it is not difficult for viruses to gain ground. Therefore, if you find that the screen appears during use, you need to immediately turn off the power of the monitor, and then enter safe mode to find the reason.

2. Extra-high frequency, increased voltage damage CPU, graphics card, memory, etc.

At present, the new motherboard uses more and more "soft jumpers", which just gives the virus a chance. The so-called "soft jumper" means that the CPU voltage, external frequency, and frequency doubling can be changed in the BIOS. You can modify the BIOS parameters to increase the CPU voltage so that the virus is overheated and burned out, or increase the external frequency of the CPU, so that the CPU, graphics card, memory and other peripherals are overloaded and overheated. The precursor to such events is a crash. Therefore, if you find that the machine often crashes, you need to go to CMOS to check whether the above parameters have been changed. Fortunately, many mainboards currently have the CPU temperature monitoring function. After the temperature is exceeded, the system immediately reduces the frequency of alarms, which can basically prevent hardware burning.

3. Excessive "Explicit frequency" damages the video card

At present, many medium-and high-grade graphics cards can manually change the frequency of their chips, and the method is simpler: Change in the Windows registry. The virus changes the "Explicit frequency", and the video card is easy to burn out when it is overloaded. This kind of event is also a precursor to a crash. Therefore, do not ignore the "Explicit frequency" check when the server crashes.

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