|Sata is a IDE device, make sure PATA/ATA is enabled in your BIOS.|
"The new power supply is overkill" yes i agree, u don't need 1000w psu(all u need is decent 400-450w psu) but i believe your current 350w will do the job well even with these(9800/9600/240 gt, hd 5670/5570/5550/4670/4650) v-card installed.
Look at your BIOS for overclocking features, if it support OC u can easily push e2160 to 3ghz(333 x 9) the board support up to 1333fsb.
Make sure the PATA hard drive is set to MASTER.
We can not fight new wars with old weapons, let he who desires peace prepare for war - PROPHET.