I didn't know the EPIAs had a temp saftey feature. Mine will boot up no matter how cold it is. It's get's to -30C regularly here in Ottawa, Canada.
The problem I encounter is after the post. At the point where the windows logo appears, it reboots. Then boots back to the same point, then reboots again.
It will keep doing this until it is warm enough, the it continues on to Windows.
I have yet to figure out which part of my system is the culprit.
I have a 1G Sandisk Extreme. I know it's not rated at that temp, but it passes post and starts loading windows. That means its reading from the CF card. The ram must be getting used at that point. So what's left?
What does your system do exactly?