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Precision M6600 Won't Boot to BIOS

My M6600 stopped booting recently.  The Dell splash screen comes up with a complete progress bar, then freezes.  Holding the F12 key gives me the "Preparing one-time boot menu.." but no further progress; F2 does nothing.  A bootable USB key does not light up; a bootable CD spins up but nothing else.  I have unplugged the CMOS battery and discharged the system with no effect.  I have reseated RAM and replaced RAM with no effect.  What have I not done?

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