A friend purchased this compact desktop system as a barebones kit and when she couldn't get it going, it ended up with me.
After adding memory (2-512MB PC2100), processor (Pentium M 725) , optical drive, and HDD, the system went through POST OK, & started to load the OS from the boot CD. It then shutdown. Powering on again gets the same result. No error codes or beeps. AOpen suggested a new motherboard.
I reassembled the system with the new motherboard (UX855GME) and get the exact same result.
The hardware is stone cold & the fan is working, so I'm not leaning toward an overheating issue. AOpen's technical support has been reduced to emailing a tech that only suggested that "I borrow a friend's XCcube and try exchanging processor, memory, & power supply." Since no one within 12 states of me has one of these goofy machines, this ain't gonna happen.
I have built several dozen full-sized systems over the years, but I'm stumped by this one.