Acer L5100 install problem

Question

Just bought a Acer Aspire L5100 desktop computer. Can't figure out how this thing gets AC power. Nothing I have looks like the correct power cord or cable. It appears there is only a power cord for the monitor. Mouse and keyboard are wireless.There are little or no installation instructions and I can't find anything more online. There is a AC/DC adapter with orange jack but this doesn't match orange port on cpu. Does anyone know where to plug power into this system...or does power feed back through cable from monitor? Is it powered via the USB port? I don't know, can anyone help?