According to your description, I suggest you refer to the following information:
1. Please recall what caused this phenomenon, such as whether this phenomenon only appeared after you recently made hardware changes (such as adding new memory). If so, I suggest you try to restore the previous hardware configuration. If an external device is connected, you can disconnect all external devices and see if they can enter the system normally.
2. If the effect is not good, please keep clicking F8 when starting (or restarting) to see if you can see "Select the last correct configuration". If yes, please select to test whether you can enter the system normally.
3. If the system cannot be accessed, this situation may be related to the system or hardware. I suggest you check the hard disk in BIOS. The detection method is as follows: Press F 10 to enter the BIOS after booting, and then select Diagnostics and run the hard disk self-test (or HDD self-test option) to check the hard disk. The whole process takes about 30 to 60 minutes. Remind you to connect the battery and the power adapter for power supply at the same time during the test. (The specific steps of detecting hard disk in BIOS are not exactly the same for different notebook models. )
(1) If there is no error in the hard disk detection process and all the results pass, then there should be no problem with your hard disk, and it is likely that there is something wrong with the system. It is suggested that you can try to reinstall the operating system or restore the system after saving the data.
A. Some computers are pre-installed with windows system when they leave the factory. If you are using HP's pre-installed operating system, you can try to use the shortcut key "F 1 1" to restore the system to solve the problem.
Note: HP recommends that before the system is restored, since this operation will format the hard disk, please back up important files or data to an external storage device, such as a USB flash drive or a removable hard disk.
B. If your computer has its own operating system installed, you can try to reinstall the system.
Note: HP does not recommend using Ghost's installation CD to reinstall the operating system. The security, stability and compatibility of these operating systems cannot be guaranteed.
(2) If there is an ERROR on the screen, such as error or FAIL, there is something wrong with the hard disk. Please contact HP Gold Service Center for handling. If you cannot access the BIOS, please contact your local HP Care Pack Service Center for testing.
You can check the nearest HP Gold Service Center through the following website:
/zh/support-drivers/e support/as CPPS . html
I hope the above reply can help you.
If the above information can't solve your problem, you can log on to www.hp.com.cn/chat,, the online chat room of HP Network, and ask an online engineer to help you solve the problem further. More product information is available in www.hp.com.cn/800..