Media server starts in Stand Definition

Starting a couple of days ago whenever I turn on my media server it starts up in standard definition mode. 480i I have to reboot the server in order for it to come back in hi DEF. I called tech-support and the representative told me he has the same problem with his but there’s no known fix. I’m not sure I’m buying this because it just started happening a couple days ago and now it does it every time. I’ve had this media server for quite some time and I’ve never had this issue before. Does anyone else have this problem or can someone help me fix this? It’s extremely annoying.