Sorry you're still having problems!
If you're troubleshooting I'd always set the BIOS to default settings for as many of the settings as you can. Quick way to do that is load optimized defaults and it's always recommended to load those after a BIOS flash.
The only settings you might need to change are - disable onboard audio if you use a soundcard and enable usb support for keyboard and mouse, if needed, and maybe alter some of the system/cpu fan speed settings depending on your setup. Might need to change the hard disk boot priority to add-in card first and enable HDD SMART.
Your new ram, when your BIOS settings are set to auto, will run at 800. That's its JEDEC SPD setting. You need to manually adjust the BIOS in order to get a faster setting. Although, I wouldn't worry about that at this stage - save that for once the system is up and running.
Forget about the boot priority - your pata drive should be first. Just re-read that!