Flawed Video board

The new system works, except when it's not starting :))

It's true: the video board it's somehow broken: it starts in only about 20% of the power-ons. It's a very strange behavior, I mean, it's working or it's not working? How can this system work very well, but will start just once in a while? I've suspected my wiring, but it was done properly. I've suspected the power source, but that wasn't it (checked two other PSUs, with the same results). I've suspected some incompatibility between the motherboard and the video-board, but at the end, the guys in service told me the video-board does the same in their systems.

So that's that: I don't have a system right now and I wait a graphics card to assemble my system again.

Update: got my new board but this was even broken than the first: even lower start rate, weird sounds from the cooler (fan touching the metal cooler). Sent it back the next day.

One more week of waiting... and an new board. And, like a bad nightmare: same symptoms. This time, I wonder if it really is the videoboard's fault or the motherboard. Having issues with 3 brand new videoboards raises some questions...

For now, I'm a little tired running with my system to the techguys... but I definitely have to do that in the near future.