Tricky Memory Upgrade - HP zv6000

Wow! I had to actually research this one a bit!

I ordered memory for a client who told me over the phone that the laptop was an HP Pavilion dv6000... ( or at least I thought! ). It only had 256mb of RAM with Windows XP, so it was well overdue for an upgrade. After a few days the the memory upgrade came in. I went to install it and found out that the laptop was an HP Pavilion zv6000 not a dv6000 as planned! The dv6000 took DDR2 and the zv6000 takes DDR. Well.. that was ok I guess... I had the other type of memory available at my shop about 10 minutes away, so I left and came back to install the stick of DDR memory. I took the back memory panel off the laptop to find that it only had one DIMM slot to put the RAM in. ... ... I double checked ... and tripple checked! Only 1 slot! Well, I installed a 1024mb stick in this bay, and closed it up - thinking that it was just made with one memory slot. To verify this I went in to BIOS and found the amount of memory that it was recognizing... it was 1280mb. It was seeing an additional 256mb stick in the machine somewhere. Well... I only had the one stick of DDR memory in stock anyhow, so I left it at that and decided to go home and research it. Well.. I found out that I had upgraded the external memory chip but there was still an internal memory chip located somewhere underneath the keyboard. Why would they split the memory locations up like this? It's crazy!~

SERVICE GUIDE HP PAVILION ZV600 http://h10032.www1.hp.com/ctg/Manual/c00364919.pdf

A POST I FOUND TO HELP: http://www.dinarius.com/commentable/index.php?id=45

A YOUTUBE VIDEO TO REPLACE THE EXTERNAL CHIP: http://www.youtube.com/watch?v=Nbgt5AgzbdE