I have purchased the above mentioned item. 8gb ram + a SATA harddrive (this is detected as a bootable drive, but there's not OS on it yet).
Made a bootable USB stick with Ubuntu 14.04x64, chose boot from USB tick in BIOS, when I reboot I do not see the stick anywhere in the bootable devices list. The stick is USB 3.0 64gigs from Patriot (PSF64GTAB3USB), I can boot from it on my very old (4 years+) PC and my laptop, so the stick is out of suspicion. I also tried a USB 2.0 noname stick, which I used before for boots. No effect. It's not detected.
I am already at the point of returning the whole device back to the shop since I cannot install anything on it.