Mi Notebook Game sees boot logo, black screen, can't enter system

admin

Dear colleagues: Yesterday, I forgot to turn off the 19th model Xiaomi gaming laptop [screen in constant on state], and today my screen is in "blur" state. Then I turned it off and restarted, and I could see the boot logo, then black screen, unable to enter system. But at this time, the keyboard light was still on, and the laptop's cooling fan could rotate... For this fault, I repeatedly forcibly shut down and rebooted + plug/unplug power cable, but it didn't work either

I searched online for relevant cases, but got no useful information... Sent to the official after-sales service, because it's an old machine, the repair price feels too high...

Please give me some ideas about what caused this fault? Screen or motherboard?