Before I can answer this fully we need to know what is the P/N AND MODEL NUMBER on the bottom of the laptop. There is a difference in those models. Compaq had a big problem with the wrong model names on the laptops.
Attention: The number appearing on the front of your notebook may be incorrect for obtaining product support. This document will assist you in locating your exact model number to improve your support experience.
How to find the Model Number and Product Number printed on the Service Tag
A printed Service Tag, as shown below, is attached to the bottom of every HP and Compaq notebook manufactured since 2000.
Turn the notebook up-side-down to read the information on the tag. There may be some visual differences, but the tag on your PC should look similar to the sample Service Tag shown below.
The sample Service Tag, identifies these three important pieces of information. Use the Model Number to locate documents, drivers, and support for your notebook.
Model Number (shown in area below the bar codes)
The Model Number is unique to the hardware components, and is the most useful for finding drivers and support content.
Product Number (p/n)
When using the Product Number to find a part or driver, enter only the letters and numbers before the # sign.
Product Name (Product)
HP Pavilion dv9000
The Product Name (also seen on the front of your notebook) is not useful, as there may be duplication across several PC models.
You should record these numbers, in a convenient place, so that you have the information when it is needed to find drivers, read documents, or order parts.
If the tag is no longer attached to the bottom of the notebook, use the Auto-detection function (below) to locate the model number electronically.