Black screen but blue led on

I bought a ubook x 12. One day, a sharp object fell on the back of the ubook. After that, the screen started not appearing like darkness. I didn’t check it because I don’t have a mini dp hdmi, but it seems that only the ubook screen doesn’t come out. how can i save it? And because the back plate was dented, I ripped it off without knowing the back plate. I thought it was pressed and opened it to open it, but unfortunately it didn’t look like it was supposed to be opened. How do I put it back on? It’s a dilemma