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#11
I am as others are confused about your talk about a light for the video card, is it on the board because you mention it as being with both video cards ? O.k. so no other cables are loose on any other hardware.
You need to look also at the beep codes i showed you from the manual to determine the cause, yes it can be defective to or something was damaged during install. Nothing that states it like you mentioned for the beeps during post, need to listen few times. Only thing starting as 1 short beep is a successful boot,possible rest follows what is wrong, it should beep once on all successful boots this would be with your board. Think clearing the CMOS is just resetting the BIOS settings to default.