Screen stuck with the words Press the ESC key for startup menu

[MS3547]

 

I have unplugged the graphics card to clean the dust. After I plug everything back, it stuck at the blue screen with words "Press the ESC key for Startup Menu" on the bottom. If I press ESC in the beginning, it will go to a black screen and it will show the basic information of the computer (the information about processor and memory). At this black screen, it also show "Press the ESC key for Startup Menu" on the bottom and it will show "startup menu" at the bottom right corner. If I press F8 in the beginning, it will go to the same black screen, but it do not show "startup menu" at the bottom right corner. If I press F10 in the beginning, it will also go to the same black screen, and it will show "setup" at the bottom right corner. Can anyone help me to solve this problem? And thanks so much. 

I am wondering how can I get into the BIOS.
If I press F10 when the computer start, it will go to following screen:

Do you know how can I get into the BIOS?
Thank you very much!

I have follow the instruction to construct a USB with HP Vision Diagnostic, but the computer cannot boot from it. I guess the reason is the same – the computer cannot get into the boot menu as well.
It does matter I press ESC, F2, F8, F9, F10, it all go to a black screen with the basic information of the computer (the information about processor and memory). The black screen will show “Startup Menu” (ESC), “Diagnostics” (F2), “Boot Menu” (F9) and “Setup” (F10) at the bottom right corner. As following:

[itsmyname]

> The black screen will show “Startup Menu” (ESC)

What happens when you do tap the "ESC" key ?

Does it show a "boot menu"?

Is your disk-drive listed as one of the choices?

It is possible that you accidentally disconnected one of the two cables going into the disk-drive, or disconnected the "data" cable where it connects to a SATA port on the motherboard.