Thanks once again for your reply "hang-the-9"
Well, initially I suspected the problem had to do with the CMOS battery. I took it off the board and test it with the voltmeter. Is shows 3,3 volts, so therefore was OK. Afterward I disconnect all the peripherals i.e. hard disk, dvd drive, in addition all USB and audio connectors. And lastly I replaced the PSU with an ANTEC, but with no success. Now, the very last item left is the CPU. As I said I consider that the CPU it functions good. Unfortunately I cannot return it as I have opened the box, and does not shows any malfunction. However, I'm prepared to try another CPU, but the range for this mobo it somehow limited and this CPU is supposed to be the fastest in range. What you have to propose me as a CPU replacement? Thank you again for your time.