Way back then HP had a few models that would not power up if the CMOS battery was too low or missing. Also a few won't power up with a missing or dead main battery.
Good luck, hope what I remember helps.
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I know this is a old topic, but I have searched and searched for an answer for this problem and it still remains unsolved.. These systems, once running, will run for a long, long while. You ask HP and more than likely get no response at all. So, here goes... I have one of these systems (HP ZD8000) and it has no power. Just the little lightning symbol blinking 3 times. All the little things posted around the net has been tried more than once. Checked the power supply - Got another. Checked RAM - Got new RAM. Even changed the motherboard. Changed the processor as well. I know a great deal about systems and I cannot find out what is wrong with this thing. Any help would be appreciated
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