解决电脑开机不能启动的问题（Solve the problem that the computer boot can not be started）
The computer can not be switched on for the first time. After the power is cut off, the power is switched on again:
1., the power supply system failure led to black screen fault phenomenon: after the boot, the main panel indicator light is not heard, the main power supply fan rotation sound and hard disk lf-test sound, the whole system is silent. This is the phenomenon that the equipment in the host does not receive normal power supply. Inspection and treatment methods: the power supply system failure can be caud by AC power supply circuit breaking, AC power supply voltage abnormal, microcomputer power failure or short-circuit in host. Power system failure is not caud by damage to the host power supply, when the AC power supply voltage (abnormal overpressure or underpressure), the host power supply machine no-load and short circuit protection circuit, the host power supply inside the start, automatically cut off the power output to protect the host equipment.
奥斯卡最佳影片(1) when the power supply system fails, first check whether the AC power supply is connected to the host.
(2) confirm the AC power supply connected to the console, the ear clo to the switching power supply,
a short time switch on electricity and listen, if you hear the power of internal issue "" The noi indicates that the power supply is in the state of lf-protection. The reason is that the AC power supply is not normal or there is a short circuit in the
fighting 什么意思machine, which leads to the start of the protective circuit inside the power supply. Plea according to the following steps: first, check processing by AC supply voltage multimeter AC voltage 250V file check host power plug, if the AC voltage is more than 240V or less than 150V, overpressure and undervoltage protection circuit will start the host power supply, power supply equipment to stop the machine, plea u the power supply or UPS power supply for the host power supply.
If the AC power supply voltage is normal, one by one to pull within the host interface card and other equipment in power line and signal line, and then power test machine, such as the removal of a host power recovery device, it is just the removal of equipment damage due to improper installation or short circuit, the short-circuit protection circuit in the power supply to the power supply start stop machine equipment. If the power line of all the equipment is removed, the power supply is still in the state of no output, indicating that the power failure, plea maintain the power supply. Description: the power supply should be connected with at least one load (such as CD-ROM or hard disk), such as no-load connection, microcomputer power supply, microcomputer power supply, no load protectio
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n circuit will start, stop output.
(3) if the main power supply is not working, plea check the main power switch on the front panel of the main chassis. If the power switch is in good condition, it is usually a power failure.
2., no lf-test, black screen, fault phenomenon: after the boot, the main panel light is bright, the fan inside the machine
rotates normally, but the monitor doesn't show. At the start of the three light upper right corner of the keyboard does not flash, not to hear the lf memory from "Da " Sound and PC horn alarm sound. Check processing method: from the fault phenomenon can be en, the main power supply is basically normal (do not rule out the host power failure), but failed to start the BIOS lf-test procedures, the crash occurred. You should check the monitor, display card, memory, CPU and main switch. Becau there is no lf checking black screen fault, there is no hint information, and it can only be checked by the minimum system method. "Minimum system approach" means that only basic devices such as motherboards, memory cards, CPU, display cards, monitors and power supplies are rerved,
First check the minimum system of the basic equipment, check the minimum system to confirm th
at after the normal work, and then further check other equipment. When using the minimum system method, before opening the chassis to remove other devices, it is recommended to replace the monitor to e if it works properly. If only the minimum system is retained, the computer will not work properly after power on. The memory, display card and CPU will be checked by the replacement method in turn. After confirming that the monitor, memory, display card and CPU can work, the source of the fault is only the motherboard and the power supply. The easiest way to distinguish between the mainboard fault and the power failure is to change the power supply.
3. failures of black failure fault phenomenon: boot the host panel indicator light, machine fan in the normal rotation, rotation of the disk can hear the sound, lf memory "issued
by " Sound and PC horn alarm sound. When you e the start, the three lights on the upper right corner of the keyboard are flashing, but the monitor is not displayed. Check processing methods: the fault phenomenon indicates that the host power supply is basically normal, most of the circuit board without fault, and the memory before 64KB can read and write properly, BIOS fault diagnosis program is running, and can nd alarm signals through PC horn. This fault mainly from the display, display cards, memory, motherboards and power supply hardware problems caud by. Most of this kind of fault can be judged by horn warning sound. Since different versions of BIOS havmenstrual cup
e different encoding methods for audio signals, the MSI BIOS 5158 (AWARD) is ud as an example to introduce its checking and processing methods.
(1) if you hear "toot toot"..." For a short sound, that the machine has a slight short-circuit phenomenon, plea immediately shut down, open the box, one by one to pull within the host interface card and other equipment in the power line and signal line power test machine, such as the removal of a device when the system returns to normal, it is just the removal of short-circuit fault caud by improper installation or equipment damage. If you only connect the main board, the power cord and the tester, what you still hear is "toot toot"..." Continuous short tone,
There are three reasons for the trouble:
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The main board and the chassis are short circuited, it is advisable to check the motherboard;
Second, the power overload capacity is poor, change the power supply to try;knocking on heavens door
If the main board is short circuited, plea repair the main board. Warning: plug and drain device. Turn off the power. Live plug will damage the device.
(2) if the hearing is interrupted long sound (some machines discontinuous time longer) that is, memo
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extended是什么意思ry error detection, using the ATX power urs with the chassis panel power switch usually cannot be shut down, only directly unplug the power line. Unplug the memory, u the erar for the memory of the "golden finger" cleaning, retaining only a 168 line memory or a t of 72 line memory (in the 586 motherboard installed 72 line memory 2 root as a group), re inrt the installation to try, or if not, plea by replacing the memory test.
bullock(3) if you hear a "clacked " Sound, e the top right corner of the keyboard three lights flashing, PC horn no longer emit other sounds, and can feel the hard disk in the start-up operation, indicating that through the lf-test, it is likely to be a display fault,
Plea check whether the power supply is switched on, the display displays the power switch is turned on, the brightness and contrast of the monitor knob is accidentally shut out, the best possible after the display is connected to the other computer.音响没声音
(4) if PC hear the horn for a long (or unexpected accidents),
a fault display system; a fast three short (or unexpected
