I recently bought 2 of those motherboards from ebuyer in the same order.
One is in this pc that I am using at the moment and I havent had any problems with it.
The second that I got was for a friends pc that I built up a week later.
That had the same problem as you describe and turned out to be a faulty motherboard
To check if its anything else, it could be that the CPU heatsink isnt seated properly and the CPU is overheating and shutting the pc down, disconnect all your hard drives, floppy and CD/DVD from the motherboard.
You just want your mouse, keyboard, graphics card, monitor and ram connected, no other cards or peripherals.
Check that the CPU and its cooler are fitted correctly and start the pc up and go into the bios.
If it runs ok you can add the other drives one by one and see if that stops it running.
If its not the CPU/Heatsink then I think it will possibly be a bad batch of motherboards that have gone out.
Ebuyer verified that the one I returned was faulty and refunded my money.