Hello, I'm quite good in computers but a huge noob in linux.

I installed the latest ubuntu server amd64for my NAS and everything goes lovely except if I leave the console for too long, the screen goes blank and says no signal.

The server's still on... e.g.: I can access my webmin page.

There's no way I can access the console back through the keyboard, I can only restart...

Tell me if you need more info.