Notebook computer brings great convenience to our daily life, but in the process of using notebook computer, sometimes we will encounter the situation that the keyboard of notebook computer is locked, so what should we do if the keyboard of notebook computer is locked? What may be the cause?
How to deal with the lock of notebook keyboard: the fault caused by CMOS
Whether the notebook keyboard CMOS is correct or not directly affects the normal use of hard disk, which mainly refers to the type of hard disk. Fortunately, today's machines all support the IDE auto detect function, which can automatically detect the type of hard disk. When connecting a new hard disk or replacing a new hard disk, you need to reset the type through this function. Of course, there are some types of motherboards that can automatically identify the type of hard disk. When the hard disk type is wrong, sometimes the system cannot be started at all, sometimes it can be started, but there will be read-write errors. For example, if the hard disk type in CMOS is smaller than the actual hard disk capacity, the sectors behind the hard disk will not be able to read and write. If it is in the multi partition state, individual partitions will be lost.
There is also an important cause of failure. Because the current ide supports logical parameter types, the hard disk can adopt normal, LBA, large, etc. If the data is installed in the general mode and changed to other modes in CMOS, the read-write error of the hard disk will occur, because the mapping relationship of physical geology has changed, and the original correct hard disk location will not be read.
What to do if the notebook keyboard is locked: the system does not admit the failure of the main boot program of the hard disk
Notebook keyboard such failures are more common, that is, it can not be started from the hard disk, it can not be started from disk a, it can not enter Disk C, and it can not be found by using the automatic monitoring function in CMOS. This kind of failure mostly occurs on the connecting cable or IDE port, and the failure rate of the hard disk itself is very small. The replacement test can be carried out by plugging and unplugging the hard disk cable or changing the IDE port and cable, and the failure can be found quickly. If the newly connected hard disk doesn't admit it, another common reason is the master-slave line on the hard disk. If the hard disk is connected to the master disk of IDE, the hard disk must jump to the master disk. Generally, the wrong jumper can't detect the hard disk.
The main boot sector of the hard disk is the most sensitive part of the hard disk, and the main boot program is a part of it. This program is mainly used to check the correctness of the hard disk partition, determine the active partition, and transfer the boot right to the DOS or other operating systems of the active partition. If this program is damaged, it will not be able to boot from the hard disk, but the hard disk can be read and written after the soft area or optical area. The method of repairing this fault is relatively simple. It is most convenient to use fdisk with higher version DOS. When running with parameter / MBR, the main boot program of hard disk will be replaced (rewritten) directly.
In fact, the main boot sector of the hard disk is created by this program, fdisk. Exe contains the complete hard disk main boot program. Although the DOS version is constantly updated, the main boot program of the hard disk has not changed since DOS 3. X now has windows 95 DOS, so as long as you find a DOS boot disk to start the system and run this program, you can repair it. In addition, other tools such as kV 300 also have this function.
What to do if the notebook keyboard is locked: boot failure of wrong partition table boot
The partition table error of notebook keyboard is a serious error of hard disk. Different degrees of error will cause different losses. If there is no active partition flag, the computer cannot start. However, after booting the system from the soft or optical area, the hard disk can be read and written, and the active partition can be reset through fdisk for repair. If it is a wrong partition type, it can cause the loss of a partition. The fourth byte of the partition table is the partition type value. The normal bootable basic DOS partition value greater than 32MB is 06, while the extended dos partition value is 05. If the basic DOS partition type is changed to 05, the system cannot be started and the data in it cannot be read or written. If you change 06 to a type that is not recognized by DOS, such as EFH, then DOS thinks that the partition change is not a DOS partition, of course, it cannot be read or written.
Many people use this type of value to implement the encryption technology of a single partition. Restoring the original correct type value can make the partition return to normal. There is also other data in the partition table to record the start or end address of the partition. The damage of these data will cause the confusion or loss of the partition, which can't be recovered manually. The only way is to write back the backed up partition table data, or get the partition table data from other hard disks of the same type and partition condition, otherwise, other data will be lost permanently. In the operation of the main boot sector, Nu and other tool software can be used, which is very convenient to operate, and can directly read and write or edit the main boot sector of the hard disk. Of course, debug can also be used for operation, but the operation is cumbersome and has certain risks.
What to do if the notebook keyboard is locked: hard disk failure caused by wrong partition valid flag
There is also an important part of notebook keyboard in the main boot sector of hard disk, that is the last two bytes: 55aah, which is the effective mark of sector. When boot from hard disk, floppy disk or optical area, these two bytes will be detected. If there is, it is considered that there is a hard disk. Otherwise, the hard disk will not be recognized. When this flag is started from the hard disk, it will be transferred to ROM basic or prompted to put the floppy disk. Unable to transfer to hard disk when starting from floppy disk. This can be used for encryption of the entire hard disk. You can use the debug method for recovery processing.
In addition, the DOS boot sector still has such a flag. When the DOS boot sector has no boot flag, the system boot will be displayed as: missing operating system. The main boot sector can be used for its repair method, but the address is different. The more convenient method is to use the following general DOS system repair method