Apple computer boot black screen. What s going on with a horizontal line jumping in the upper left c

It's a system problem, reinstall the system.

On the boot interface, press del to enter the BIOS

Press the right arrow to switch to boot and select Hard Disk Boot.

Press F10 to exit and save, and restart the computer.

If you can't get in, there is a problem with your hard drive system. Then let's install the system.

If there's a problem with your computer, take it for repair.

Reboot, turn on and press the F8 key to select the latest correct boot, it is not a major problem with the hardware and system, and it can be booted.

1. The system is damaged, reinstall the system.

2. If there is a problem with the power supply cable or data cable of the hard disk, plug and unplug it again.

3. The partition table of the hard disk is corrupted and repartitioned.

4. The system did not debug the hard disk to the first boot item, after entering the blos, adjust the hard disk and try again 5, there is a problem with the hard disk, detect and replace it.

It should be that the system is down.

It is also possible that there is a memory problem.

You need to check if there is any problem with the memory first. Then consider reinstalling the system.

It could be the system that there may be an error with the boot boot.

Unplug all external devices such as USB flash drive data cables, restart and try again.

This seems to be no problem, I've seen a lot of machines have such a situation, as long as you can successfully self-test, there will be no problem to enter the system, and I haven't found any problems with this, my book is the same, there is no problem, it's normal, is there a potential problem??

1. If the first boot item of the motherboard BIOS is not set properly (usually set to optical drive and hard disk), the system will not boot, so there is a cursor jumping in the upper left corner.

2. This phenomenon may also be caused by an error or damage to the Master Boot Record (MBR) of the hard disk.

3. It may be that the operating system has been corrupted, or there is a virus, causing the operating system to fail to boot.

Ask what to solve.

After entering the boot menu, select the USB flash drive item to start, and press the Enter key to enter;

Then, enter the U disk menu and select PE system to enter;

After entering the PE desktop, select the desktop "DiskGenius Partition Tool" icon, double-click to launch, open the main interface of "DiskGenius Partition Tool", and select the "Hard Disk" item in the menu. Click to open the drop-down menu;

Finally, in the menu under the "Hard Disk", select the item "Rebuild Master Boot Record MBR", click on it, the Master Boot Record will be automatically repaired, close the program after completion, exit the PE system, restart the computer, and you can boot from the system normally.

Upstairs explained clearly, I'll add, you asked.

Press del to enter the BIOS when booting up, and the following options can set the BOIS to the default settings.

load bios defaults

Load the BIOS initial settings.

Load Oprimum Settings loads the motherboard BIOS factory settings.

The easiest way to do this is to remove the BIOS jumper or unplug the battery from the motherboard and install it on it.

The horizontal line you're talking about is the cursor, so there's no need to worry about him! Press Delete to enter the BIOS settings interface, find Load 0ptimized defaults, click Enter, and select Yes

If the self-test is completed. The cursor appears in the upper left corner. Most of that is due to the system.

Is there an alarm sound during the self-test process? If there is a problem with the hardware, the self-test will be alarmed. If there is no alarm sound.

This is possible due to unstable memory or a problem with the hard disk. It is recommended that you restore the system first.

There is no alarm sound. It's best to put the motherboard down first. Problems need to be solved one by one. If you can't even solve the problem of calling the police. You'll have to find the reason from the motherboard.

The system is broken, let's reinstall the system! Remember to check the hard disk before installing the system to see if there are any bad sectors!

Try reworking the system. It could be an issue with the software. It is also possible that the hard disk has bad sectors. It can be measured with software. It is recommended to make a system to see the situation first.

It should be a system problem, and it can't be entered if the installation mode is not available. Then choose the reloader.

The problem with the graphics card is that the screen is still the system problem, and the heroes upstairs.

See if it's plugged into the U disk, just pull it out and open it again.

The computer has a black screen, and this situation generally has the following aspects:

1. After booting up, it emits a continuous sound of "Di Di", black screen, which is a fatal error of the system and cannot be continued, and the alarm is given by the speaker, indicating that the memory module is damaged, or the memory module is polluted by the gold finger, or there is too much dust in the memory slot.

2. After booting up, there is a continuous sound of "beep", the screen is black, there is no heating on the surface of the CPU, or the heat generation is obviously low, which is generally due to the damage of the voltage adjustment tube on the motherboard.

In this case, there may be a problem with the system, try reinstalling the system. Over,