Can't install OS with new GA-MA770T-UD3P

Hello guys and gals,

I just put this system together:

New parts:
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1. Gigabyte GA-MA770T-UD3P

2. Phenom II 720BE

3. 4gb G-Skill 1333

Old parts:
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PNY 8800gt

520w Aprevia PSU

Maxtor DiamondMax 10 Sata

Nec DVD-Rom

Problem:
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The thing posts just fine. The problem starts when I try to install Win7RC.
It usually hangs with the message " boot from cd\dvd". Sometimes it moves beyond that and says, "press any key to boot from cd\dvd".

I press 'anykey' then the system hangs, while the dvd and hdd lights remain solid. Very rarely, it says something like, "can't find bootmgr" or "there is a problem communicating with one or more devices."

I have tried different installation disks too....


Any ideas?

Actually, no matter what your SATA controllers are set to, the IDE channels will be seen as IDE - for example, I have my primary controller set to RAID, and my jMicron set to AHCI - it still 'sees' the IDE DVD as IDE, and boots accordingly...

I'm guessing power supply - not enough 'oomph' for the added new pieces?