For me, it's closed.

With a little help from #greetings, the IRC channel, and especially from Anti-Hero, i managed to find the cause. As AH suggested, i try-ied to re-seat the ram module. It worked. As I looked further, there was an IDE cable which migth have hit the ram module, making the system HALT.

W/o reseating the ram module, I could reboot until I had artritis, the system would HALT.

Tx you all!