I've also plugged my HDD into another working computer & reformatted it again & put it back into my computer but when I press any key to boot from CD or DVD it still gives me that same error screen above, no matter which Windows 7 boot disc I'm using. Swapping HDDs plugging HDDs into different SATA ports w/ different SATA cables. I've also tried removing RAM, putting RAM in different slots and different configurations. Tried a windows XP install disc but the screen hangs at Windows is starting Installation forever & will not start. Tried my original Windows 7 RC disc & also burned another copy of 7 RC at 1x speed w/ imgburn, still same windows boot manager error when i try to boot from disc. I have no idea what can be causing this I spent hours in the BIOS tweaking settings & resetting, yet nothing seems to work.
The weird thing is that I even swapped in a different hard drive and powered on and boot from disc and kept getting the exact same error message.