The system appears to POST just fine. The next screen is just a perpetually blinking cursor. I've seen that it does appear to detect my RAM and my HDD during POST as well as in the BIOS. I've attempted to boot from CD but it's the same perpetually blinking cursor. The HDD and CD are definitely spinning. I'm soon going to try booting from a USB.
I've done everything I can think of: reseated everything and cleared the CMOS. It won't load the operating system with different RAM, HDD, or PSU installed.
I haven't made any recent changes. It's been sitting unused for a couple months.
The system: AMD Phenom 955, Gigabyte 790XTA-UD4, Antec 650W, WD Caviar black, ATI Radeon 5850.
Everything is set okay. One thing I noticed, the voltages are off slightly. For example, the RAM is set to 1.5, but is receiving 1.488. I can't remember if they are always like that but I'm totally out of ideas.