Hi,
Sorry to ask a dumb question but...... after flashing BIOS you did remember to load optimised defaults.
Another thing to try would be to completely clear BIOS (CMOS) by disconnecting your PC from the power supply, removing the Mobo battery, wait for a minute and then put the battery back and restart the PC.
Although you have tested your HDD's in another machine there could still be an issue there or even with other components.
Could you post your full system specs, OS and if you are over-clocking to help with further trouble shooting if there is still a problem.
cheers
Yes I did load optimised defaults.
I have tried clearing the bios via those methods, but it is still the same.
I have my cpu overclocked slightly to 3.6Ghz, but I have put it back to stock and it still hangs.
My system specs:
AMD 955 BE C3
4GB Corsair 2X2GB XMS3 1333Mhz DDR3 memory
Asus HD4850 1GB
Creative PCI-E X-FI Extreme Sound Card
WD Black 500GB HDD Main OS
Maxtor 250GB HDD Storage
Seagate 750GB HDD Storage
Windows 7 Ultimate 64 Bit
I think thats everything.......