I KNOW I KNOW!!!
That exact same situation happened to me with a Gigabyte low profile computer.
Used the dang thing for 3 months straight at work, packed it up in its original shipping box and stored it in my house for a month, then took it back to work. Pluged it back in and tried to power on; BEEP beep BEEP beep..........high low high low. Finally figured it out.........
Dead CPU!!!!
Dont ask me why but I dropped in a spare CPU from another machine and up it came. Shut it down and put the old one back in, same thing.
Now can some one explain to me how a CPU dies while it is sittting in a machine, IN its orignial box, IN a controlled environment and dies from NO USE?!?!?!
Sorry man.