we have a knew symptom. it stays on when the 4 pin square connector is unplugged, obviously without i get no image on screen but that narrows it down.
Are you sure it's the correct 4 pin connector going to the cpu? Some ATX supplies have 2. One 12v only connector for the cpu and the other is an extension of the 20 pin power connector. It's not hard to mix them up.
yea sounds like the same problem, i have plugged the right power cable in, 2 yellow 2 black. im out of ideas now.
AMD x2 5000+ black edition at 3.3GHZ zalman cnps 9700-NT
Gigabyte GA-M57SLI-S4 motherboard
3072mb: OCZ ddr800 gold
2x 7800GTX in SLI for 20" viewsonic
OCZ 600watt power supply www.angelic-accessories.co.uk - plug for my gfs site