Ouch.
Have you removed all extraneous devices? Disconnect everything that isn't keyboard or video. Traditional non-USB keyboard, if you have one.
I've seen MBs choke in POST with what seemed like normal functioning devices attached. Even something as simple as a misbehaving USB flash drive can cause it. I have a couple Lexar sticks that catch me out when I forget and leave them in machines.
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There are a vast number of people who are uninformed and heavily propagandized, but fundamentally decent. The propaganda that inundates them is effective when unchallenged, but much of it goes only skin deep. If they can be brought to raise questions and apply their decent instincts and basic intelligence, many people quickly escape the confines of the doctrinal system and are willing to do something to help others who are really suffering and oppressed." -Manufacturing Consent: Noam Chomsky and the Media, p. 195
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