Kami Droh

Good morning ! Could someone help me please. I have an HP notebook model laptop. Yesterday I wanted to install the Linux system with Ubuntu and it didn't work But the strange thing is that since yesterday my screen displays all black with the sentences ''no bootable device -- insert boot disk and press any key'' . And I tried all the means offered to me on the screen, nothing worked. As I already have my Google Drive which saves all my data so I want to format my pc. help me please