Tigere - this unit is what I call a transition unit. It came out about the time that XP was coming off pre-installed and Vista was coming on. This particular model only came with Vista, but others in the dv9000 series came with XP. One would think you could simply go back and install XP on this machine and merrily go on your way. Such may not be the case however.
Subsequent to my generating the document From Vista to XP, other information on these machines came to light. As a result of some investigation and experimentation in attempting to solve a posting from another member some months back, I generated this document
Problems Installing XP with Intel 82801 AHCI.
Lets try the easy road first - start you laptop and as soon as the POST stops (the display screen at the beginning) disappears, press and hold F8 to boot into safe mode. This will look very different and may even be called ugly, but it is very basic. Once the machine has completed booting and you are looking at a primitive desktop, your icons should all be there, but no side bar nor background image. Click on the Start button and then Control Panel. You will see a very different Control Panel, the classic view, but you want to click on Programs and Features and then installed updates. Locate Service Pack 1 on the list of updates, highlight it and then click on uninstall at the top.
If this fails, then your machine should have come with a recovery partition. You should have also been prompted to burn Recovery DVD's when you initially set up the machine.
If you have not, you may still be able to utilize the Recovery Manager on this machine, here is an excerpt from the HP page:
Restore the PC to its original condition with the HP Recovery Manager if Windows Vista is not accessible
If
the PC cannot launch into Windows, it may still be possible to use the
HP Recovery Manager on the hard drive to restore the computer to the
original operating condition by following the steps below.
# Press the
Power button
to start the PC and immediately press the
F11
key to open the HP Recovery Manager.
#* If
the HP Recovery Manager can access the hard drive, a prompt is
displayed to backup the user files before beginning the recovery.
Follow any on-screen instructions.
#* If
the HP Recovery Manager cannot access the hard drive to fix any system
errors, use the set of recovery discs to recover the hard drive to its
original condition.
If this does not work, and the F11 option will not open the Recovery Manager, then your only other option is to order the recovery discs from HP. Here is a
document generated on this topic by mphenterprises.
If you want more information about the
HP Recovery Manager just follow that link.
Regardless, the recovery programs will return the laptop to the factory shipped condition, which means that anything you installed, programs and data will be gone. If there is critical data, then order a suitable SATA laptop drive and install in drive bay one. This means that you only have two options to reinstall, the recovery DVD's you burned, or order a set from HP. They are about $25 I believe if ordered after purchase of the machine. Your machine should have the second drive bay, but it only came with one drive. I do not know if the machine shipped with the drive tray and screws in the second bay or not. If it did, you can then install the original drive in drive bay 2 and copy the data off once you have the OS on the new drive in bay 1.
If there is no critical data or if you have (hopefully) a current backup, then you can forgo that step.
I know this is a lot of information and probably like trying to take a drink from a fire hose, but this occasionally happens when doing a major upgrade like installing SP1. Before upgrading my three machines to SP1, I generated a clone of each of the system drives, but that is another topic.
Once you get the system back to where it is supposed to be, you should open a new discussion about ways to improve the processing speed of the machine. I believe there are some steps that can be taken, but one thing at a time.