I am running a web server at home using Ubuntu 11.4 (maybe? I can't 100% recall) on an older AMD 2400+ desktop with 1 or 2 GB of RAM. Sorry I can't recall the details 100%.
Anyway, I have a KVM hooked up to a monitor and PS2 keyboard that I use to switch between the server and my iMac (The keyboard is only hooked up so I can switch between the two easily. Many times a week, Pingdom will tell me the server is down and I can't hit the server. When I get home (it rarely happens when I am home), I hit the Ctrl key twice to switch to the server, hit the space bar and everything is now up and running again. I need to look again, but I don't believe there is any power saving features turned on in the BIOS.
Does anyone have any other suggestions of what I may have going on? I have my uncle's website running on it now and I really would like to have a better up-time than 95%
As a note, I do not have any GUI installed so everything has to be done on the console (or through WebMin) and I know my way around, but I am by no means experienced.