PROBLEM: My computer freezes at the ASUS Sabertooth X58 motherboard splash screen. I do not even get to Windows 7. Multiple reboots failed to solve the problem. Trying to boot from the Windows 7 rescue disk yielded the same probem. So I decided that downloading but not yet installing Windows 10 could not be the problem. It had to be a motherboard issue.
SOLUTION: While opening the computer to determine the motherboad serial number, I found the inside to be filthy. So I cleaned it. I buttoned it up, rebooted, and everything worked perfectly.
MORAL; (1) Clean your computer at least one every 6 months. Put the task on your calendar and DO IT.
(2) Sometimes it is the simple stuff that will drive you nuts.