Restart/Reset Problem

Hello all,

I'm getting a rather strange problem, when I try to restart the computer from Windows 7, or after making changes in the BIOS the DRAM_LED comes on and stays on (red). I've tried to change some power options within the BIOS but that didn't seem to work.

I've run memtest86+ on each RAM seperately as well as in dual channel mode, no errors came up.

I'm thinking it is the motherboard being faulty but any other ideas?

My system spec is:

ASUS M4A77T Motherboard
Phenom II X4 955
4GB DDR3 (2x2GB) Geil PC3-10660 1333MHz
Gigabyte GeForce GT 220 720Mhz 1GB PCI-Express 2.0 HDMI
500W PSU (Also tried with a 650W but still the same)