Hello folks, I have a problem with NEW RAM in my laptop.  I have a relatively OLD computer, a HP Pavilion zd8000 with 512 MB of RAM.  I researched this particular model and discovered I could upgrade to 2 GB (1 GB x2) of PC2-4200 DDR2, while I currently have 512 MB (256 x2) of PC2 3200s 200 pim DDR2.  So, I checked and re-checked and finally ordered the new RAM.  I know it's nothing phenomenal, but for what I do with my computer, 4x the RAM would help a LOT.  I received the RAM in the mail today, Kingston brand, and properly installed it.  When I turned my laptop on it BEEPED several times and stayed on.  The fan was running but the screen was blank.  The only other activity was the power button blinking on and off.  Otherwise, the laptop would not respond to anything I did.  I don't know what the problem could be.  I even went to the HP website prior to my order and double-checked that this model could handle the upgraded RAM.  Any suggestions???Have you tried it with just 1 stik ? ?No, I haven't.  I will try now.  I guess I was under the impression that both sticks were required.  I'll say it now, I'm not that educated on how some of this stuff works.There are no specs for that laptop on HP's website.  CRUCIAL doesn't even have a listing for it.
Run the Crucial scanner tool:  http://www.crucial.com/index.aspx

Found the Service Manual:  http://h10032.www1.hp.com/ctg/Manual/c01383095.pdf
I think it supports 2-1GB modules, DDR2-400, (PC2-3200)
See Table3-1, p.3-7Which means it may not be able to run PC 4200...