Hi, Not sure which prebuilt Aegis model you have on hand. Please try disconnecting the AC power cord for a few minutes before reconnecting it. Then, make sure that all other cables, including the HDMI, DP, keyboard, and mouse cables, are securely connected. After completing the steps above, please check whether the issue has been resolved. If the problem persists, you may submit a Web Ticket (OCSS) or contact the service center for further assistance.