Is the computer in the box? I can see hard drives suffering from cold, and perhaps fans, but that should be it. I have my PC in the garage, and it has always booted up at temperatures down to -20 C; much colder, and I don't think I would be out there except for 'night before Christmas' scenarios . ... Steppers can dissipate heat, so I let them idle with the G540 active for a 5-10 minutes before putting them through serious warm-up exercises, then on to cutting. So far no problems.
Paul Rowntree
Vectric Gadgets, WarpDriver, StandingWave and Topo available at PaulRowntree.weebly.com