In regards to your inquiries, I have the following comments/suggestions:
1. "[After] upgrading the BIOS to either 5559 or 5561, the cpu fan [started running] on maximum all the time."
Just to be 100% sure, restart the system into BIOS. Once in the BIOS setup utility, press <F9> to restore BIOS default settings. Reset any customized BIOS settings. Clear all DMI event logs by setting the option to "Enable", which is located in the Advanced/Event Log Configuration section of the BIOS Setup utility. Finally, press <F10> to save the new settings and reboot the system.
2. "...would like to know where [you] can get the original Intel SATA cablle from"
I confirm our Intel(R) Desktop Board DX58SO does come with 4 SATA cables (click here). Hence, I'd highly recommend contacting your place of purchase regarding the rest of the cables.
many thanks for your response. After upgrade to 5561 i had switch the power supply off for around 20 seconds. After restarting the pc the cpu fan runs low again. FINE :-)
I had called the support hotline here and got a very friendly agent on the phone. He had rechecked and indeed there should have been 4 SATA cables inside. They raised an RMA and send me 3 missing cables. THANKS TO THE GREAT INTEL SUPPORT!!!!