Check the manufactures operating specs on the LCD and the hard drive. I know the LCD's have issues in extreme cold but I would bet the hard drive was the cause since it was only down to 35 F.
I would also bypass the ITPS for testing purpose if it happens again. Could be something simple like the cold HD demanding too many amps to spin up and the ITPS voltage regulator peaking out. I have seen the same thing while testing with a questionable 3.5 hard drive, CD and a floppy drive all powered through the ITPS. I bypassed the ITPS and stopped it.