Update, on my comment, the manual says 19V ATX power supply. NO SUCH THING! HDplex was the only reasonable 19v supply, but it is, and was, not a ATX supply.
The 4-pin molex for CPU power on a ITX board is 12V, not 19V. 19 Volts was never written into the ATX specs. There are some Thin ITX boards that are dual voltage at the Molex, 12 or 19, but 19 is above the spec. and HDplex was the last quality high-wattage internal supply, the rest are low-quality steel-cased crap IMO. To be safe you are better off with a quality 19v GaN brick.