Did you try these steps for your HP Compaq NX9005?
1. Remove AC power
2. Remove system battery (primary and Multibay if present)
3. Remove hdd from hdd bay
4. Remove Multibay Devices from Multibay
5. Remove small round battery pill 3.3V, located under a cover on left side of touchpad. Remove cover gently (is no need to remove keyboard, but cover is removable with some power...) Delicately unplug small connector with cables leading to battery,
6. Wait 5 minutes
7. Connect AC power
8. Turn on computer unit (BIOS gets a few errors = date, time, mismatch etc. no need to panic, if everything is ok then get into computer setup pressing F10, change existing setup values as needed, if ok power down computer.
9. Unplug AC power
10. Plug small battery into motherboard
11. Install Hdd and multibay devices
12. Install system batteries
13. Power Up computer.
1. Remove AC power
2. Remove system battery (primary and Multibay if present)
3. Remove hdd from hdd bay
4. Remove Multibay Devices from Multibay
5. Remove small round battery pill 3.3V, located under a cover on left side of touchpad. Remove cover gently (is no need to remove keyboard, but cover is removable with some power...) Delicately unplug small connector with cables leading to battery,
6. Wait 5 minutes
7. Connect AC power
8. Turn on computer unit (BIOS gets a few errors = date, time, mismatch etc. no need to panic, if everything is ok then get into computer setup pressing F10, change existing setup values as needed, if ok power down computer.
9. Unplug AC power
10. Plug small battery into motherboard
11. Install Hdd and multibay devices
12. Install system batteries
13. Power Up computer.