I recently bought a new case (Antec Sonata II). After moving my previosly functioning PC into it, the motherboard (Asus P5B-Deluxe) started powering off randomly, usually within a minute or two of powering up. I tried replacing the power supply with a known good one (the PS from my previous chassis), and still it exhibits the same behavior. I tried resetting CMOS on the board, I tried reseating the PCI cards, and I tried booting without peripherals. No luck The only difference between this setup in the new chassis and my original working one is that I'm using a new SATA disk. What could possibly be causing this? Any ideas/suggestions?