Press and hold on/key 15 seconds to try to see if the machine can be turned on. 2. If it still doesn't work, I suggest you reinstall the system. You can log in to BBK Education Electronic official website-click Download-Software Download-to find the corresponding model, download the recovery tool to the computer desktop, decompress it, and copy it to the memory card. With the help of a memory card, you can restore the system and upgrade it. After downloading and decompressing, you can also see detailed operating instructions. Ha.3: If it still hasn't recovered, I suggest you take the machine to the after-sales service center and ask the staff to check and repair it for you. You can log on to BBK Education Electronic official website-click on the service to view the after-sales address.