HP Pavilion xz300, Service Manual, Page: 56 / 100

2-34 Removal and Replacement Technology Code ID)
Reinstalling the Motherboard
Reassembly Procedure
1. Insert the I/O connectors through their openings in the bottom case, then lower the motherboard
into place.
2. Make sure the PC card eject button fits into its slot in the bottom case.
3. Make sure the alignment posts in the bottom case—near the CPU module and PC card guide—fit
through the corresponding openings in the motherboard.
When Installing a New Motherboard
After installing a new motherboard, you must electronically transfer to it the serial number and service
ID from the previous motherboard.
1. Exit Windows and boot to a DOS prompt.
2. Run ESN.EXE from the same source you used when saving the serial number and service ID from
the previous motherboard:
•
On a factory software installation, change to the \hp\drivers\hputils directory and type
esn
at
the prompt.
•
Otherwise, copy \hp\drivers\hputils\ESN.EXE from the Recovery CD, then run it on the
notebook.
3. Install the serial number and service ID.
•
If you are prompted for the serial number, type the serial number shown on the bottom of the
case.
•
If a serial number has already been stored, you must call an HP support center to change it (see
page vi).