Pavillion zv5000 laptop wont boot from cd after mobo and hdd replace

So I inherited a dead zv5000 laptop with no hdd. I replaced the motherboard and CPU, and it powered up and booted from the cd drive with no hdd installed. I was able to run memtek and the original hp os recovery discs, with no hdd installed.
Then I put in an empty hdd. The bios sees the hdd ok, but I suddenly can't boot from the cd drive. The bios settings are correct, and the discs spin in the cd drive, but it wont boot with the recovery discs, memtek, or an original xp install disc.
When I remove the hdd, it still wont boot from the cd drive.
So I google and I read stuff about hp tattoos on hdds and motheboards and dmi, and no passwords for the average person to do the tattoo.
So what do I need to do ? I don't understand why it was good with the new motherboard, but as soon as I plugged in an hdd it wont do anyting. I cant update bios because I cant boot past the bios, and not sure how that would help anyway.

If you have an open firmware password, delete it. It will not boot off anything but HD with OF password. Or at least thats what it was for me.

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*******DISCLAIMER********
I am not an employee of BBY in any shape or form. All information presented in my replies or postings is my own opinion. It is up to you , the end user to determine the ultimate validity of any information presented on these forums.

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[Limitation of external boot media for Satellite, Satellite Pro C50 & C50D devices|http://aps2.toshiba-tro.de/kb0/TSB3B03JA0000R01.htm]
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Pavillion zv5000 laptop wont boot from cd after mobo and hdd replace

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