Like a collection device, after the computer is turned on, the database cannot be connected, and the

The possible reasons appear in six aspects: first, is the power supply of the computer problems, such as switching transistors, fuses, rectifier diodes, filter large capacitors, and so on, can not conduct the power supply, can not output voltage and current, the host has no voltage and current naturally can not turn on, Jianyi to replace the power supply, second, is the host plug problems, check the plug and socket whether there is a problem. Reconnect.

Third, there is a problem with the boot circuit of the motherboard, generally the triode, capacitor, and resistance of the boot circuit, there is a problem with the IO, there is a problem with the CPU power supply circuit, etc., as long as these original devices are replaced, it is OK Fourth, the memory and the gold finger of the graphics card in the host are oxidized, resulting in poor contact between the memory and the memory slot, and the poor contact between the graphics card and the graphics card slot, which causes the hardware incompatibility, which leads to the inability to boot. Solution: You can turn off the power first, open the compartment, dial out the memory, use the eraser to the part of the gold finger (that is, where there is a copper sheet,) wipe it back and forth a few times, and then change a memory slot to insert it back, it's OK, if there is an independent graphics card, you can also use the same method to deal with the graphics card, just don't change the slot, it's OK, fifth:

It is that there is a problem with the boot and twist on the host panel (such as not being able to bounce up, broken), it cannot be turned on, and it cannot be turned on, so that it cannot be turned on, replace the torque or change the cable, the sixth is: There is a problem with your graphics card, such as the video memory of your graphics card is soldered, the connected transistor of the VGA, the chip resistor, and the capacitor have problems The power supply of the control chip is insufficient, and there will be a crash, restart, abnormal display, and no boot, etc., so it is recommended that you repair the graphics card, that is, repair the video memory. Or replace the graphics card. Among them, you should pay special attention to the fourth situation, which is 80% of the cause of the host computer not being able to turn on.

Ping to see if the server address is unblocked.

If you don't specify what software it is, if the software needs to connect to a remote database, if the SQL on the remote server is not started, or if the remote server is not running properly, this prompt may appear.

If the connection is to your native database, then you check if your native database is started

If the computer can't connect to the database, it depends on whether your computer's database is a local or LAN database, if it's a local database to see if the database service is started, if it's a LAN database to see if the network is connected, if the network is okay, check whether the server service of the database installation computer is started.

The test connection to the database is unsuccessful, and the contents in the connection server settings dialog box are correct. 1. The reasons for the general problem prompt are as follows: 1. First of all, see whether the server computer has turned off the Windows firewall or Rising firewall 2. The LAN is not connected, and the LAN is not connected, that is, the computers in the LAN do not reach the access that does not require a user name and password, that is, they cannot access each other to share files, and can judge whether the LAN is smooth by whether the computers can access each other and share the files.

Method: Enter " in the address bar of "Network Neighbors" plus the "computer name or local IP address" of the computer you want to access and then link (for example, you can access the LAN is unblocked3, the database service is not started, if the database is not running, the software test connection will also have a problem prompt. You can start --- servicemanager --- the program --- the start menu, or run it --- the start menu--- enter cmd --- enter--- enter netstartmssqlserver at the cursor where the black screen appears--- and enter, if the prompt is "The required server has started", it means that the database is already running; "Invalid service name" indicates that the command entered is incorrect; "Unable to start database service" means that the database file is corrupted or the database service cannot be started due to other reasons. View the original post

The store database server is not open.

Normal single-store software needs to open the database server and store management server, and the synchronization tool should be opened in the chain.

If you look for it, normal software vendors are set to start automatically when they are installed, and sometimes they will be manually canceled or accidentally removed.

ntsysv selects network start, save exit,

ifconfig eth0 up, then service network restart to try.

Mercer is divided into client and server, do you only have the client installed? The database will only be initialized after the server is installed, otherwise the client will not be able to connect to the database.

I'm also having the same problem, install sql first, then sp4, restart, then settle mershi, run, register, ok

Whether the database is to be deployed manually, and whether the connection socket is correct

This is related to the manufacturing technology of the hard disk, like the mechanical hard disk, which can run at the time of boot, after the boot.

If the operation is gradually slow, and the data reading is slow, it is recommended that you change the drive letter format of the hard disk to NTFS format.

Remove redundant antivirus software and system pretreatment items, or use Optimizer to optimize them.

It may be because of the QQ hanging. The system automatically allocates a large amount of memory to QQ.,That's why it's going to be.,Either because of the user host、Access network、Metro network、Internet、Server, etc.。

Install a 360 security guard,Set the boot start item,In the boot item and then disable the infrequently used one,So that the boot is much faster。 This method is the easiest, I hope it helps you!

Careful anti-virus may be caused by memory not being released, or individual processes occupying too much CPU resources.