I am currently having issues with the USB COM port on my Epia mobo, I can't get it to boot from USB period. I am using a SATA to USB converter for my HDD and I can boot fine from my other PC... this one just don't want to load it at all. I had to put the HDD in my other pc and installed windows like that since you can't install windows via USB anyways. I have USB Keyboard enabled, I have USB HDD set as my first boot device. I can't understand what I am doing wrong. I am glad I am doing this on the bench and not in the car haha. I am thinking of buying SATA to IDE converter but I really would rather use USB 2.0 for the HDD.
Also, could this be happening because I am using the USB port on the mobo and not the one that is for the case, if it has one?
I bought one of these years ago (let me know if you need a spare, lol). You won't be able to install windows using another computer as it will install hardware specific things that will most likely blue screen when attached to the EPIA-M. You best bet is to get an SATA to IDE converter and find an IDE DVD drive just to install windows. I have booted PE's from USB on this board but it takes an incredibly long time. You are better off with the IDE.