You probably need to flash the bios. Use your old cpu for this and the last bios version listed for your board. 1604 is the bios version for the 9850, but the latest version covers all previous versions. I've never done this with an asus board, but I do know you have to disable any "boot block" settings in the bios, and disable windows or other software "firewalls" to complete the bios flash. You may also get a yellow warning strip from windows 7 while in explorer, so I right click on the mouse to get the option of allowing the file to open. You can use a windows flash program if asus provides it, or download the flash program to a floppy drive or usb drive. Others will have to advise you to finish the process. You must have a good power supply and not live in an area with frequent power outages. If the computer goes down during a bios flash, the board will be dead. The first part of the flash program erases the old bios file, loads the new file, then checks it before saying it's finished or rebooting the system at the end of the program. Good luck.