I changed win7 to XP and now I can t turn on the computer for help

Here's the thing:

Yesterday I wanted to get an XP with a simple and easy to use.,Here** a winxp ISO system with the Rubik's Cube U disk boot made a U disk system The result can't be loaded in and prompts an error Then open the original win7 system normally After shutting down, it can no longer be turned on The battery does not work, and the power supply does not even have a power indicator

I tried to install this system on the second computer, and it turned out to be the same, and it was paralyzed. Asking for education!!

You are losing the boot file.

I don't know how you do the system, I don't know how far you have done, whether you have done the system or not. So I'll give you a systematic approach first:

2. U disk (PE installation method): 1. Online ** system (the original system has been backed up and can also be used). 2. Prepare a USB flash drive (8G or larger is recommended), and follow the methods and steps inside, which is very detailed.

3. Disc installation method: Keep pressing the del key when booting up, enter the BIOS, set it to start from the optical drive, exit after saving, put in the disc and restart the machine, select the installation system option after entering the installation screen, after installation, before restarting, use the previously mentioned method to change the boot mode to start from the hard disk, and restart the machine.

Special note: If there is an accident in the installation process or the installation of individual machines is not ideal or ideal, or some hard disks have reserved or hidden partitions (left by the system with win7 or better version, usually 100-hundreds of megabytes), please enter the PE system to format them and repartition them before installation.

If you are a laptop, there are three modes of ATA AHCI IRRT in SATA Operations in BIOS, you can try to change it and redo it.

It is recommended not to use the XP system, there will be vulnerabilities, for security reasons.

Format the C drive. Install the system from the ground up, do not do a system upgrade installation.

Hardware is not compatible.

The system and motherboard are not compatible, and the motherboard does not support it.

The drivers are not compatible.

The causes and solutions are as follows:

The phenomenon caused by the problem of hard disk mode is caused by the fact that the hard disk is SATA but the driver is not integrated in the XP system. You can change the hard disk mode before installing the system;

1. Restart the computer or turn on the computer, then press the corresponding shortcut key to enter the BIOS setting window when the boot screen appears, use the arrow keys on the keyboard to select the "Config" option in the BIOS settings window, then select "Serial ATA (SATA)", and press the Enter key to confirm.

2. After opening Serial ATA (SATA), you will see "SATA Comtroller Mode Option [Compatibility]", press the Enter key to select it.

3. At this time, a selection window will pop up, we will switch its mode to "ahci", press the enter key to confirm.

4. After the mode switch, we can see that the parentheses after "SATA Comtroller Mode Option" are changed to "AHCI".

The system is not installed, let's reinstall it.

If your system is not installed correctly, it is recommended to replace the system installation disk.

The software is not compatible with the hardware, it is recommended to change the motherboard.

If it's a desktop, take the case cover apart and tighten the hard drive cable. This is due to the fact that the BIOS cannot find the hard drive when the computer boots up.