Even though the laptop is plugged in and the battery is ALSO in, the laptop doesnt power on.  the power led on the front lights up, and the battery led flashes (indicating that the battery is low) , but the computer still doesnt turn on. 

I took the battery out and just plugged in the AC adapter, but no dice.  The power led lights up but the laptop wont power on

I took out the battery, the ac adapter and the ram.  I then pressed the power button for about 2 minutes to dissipate any static electricity, then I put everything back.  But still no luck

any idea what i should try next
A new HARD drive?It's dead, sell it for PARTS. Quote from: Computer_Commando on December 15, 2010, 03:29:49 PM

It's dead, sell it for parts.

what about the AC adapter?

Seems unlikely.  OP said:  "The power led lights up but the laptop wont power on."

I know this is a old thread, but I have searched and searched for an answer for this problem.  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