My laptop model hp pavillion dv2000 would automatically shutdown and i will press the on button and it's from the start again

There is no reset button on the dv2000.To reset the laptop remove AC power and battery,hold down power button 30 - 60 sec,plug in AC power only and press power button.This method is called a hard reset.If all goes well shutdown - remove power - replace battery and job done!

To solve this, simply press the Fn+Numlk or depending of the model, press the button or Fn + Shift +Numlk

unplug the power and take out the battery then use a metal object to place accross the computers battery terminals all at once then try to start it up again this will reset the bios

Sounds like you have a driver issue.

Start up in safe mode (press the F8 button about once per second after you power on), and select safe mode with networking.

When you get into windows, use windows update to download all updates for both software and hardware (update will till you that there are optional updates available, download these as well),

Hopefully when all that has completed you should be able to run your computer as normal. If not there may be a problem with the memory installed on the laptop.

Regards

try hard drive testing software.
If that no work - could be motherboard.

http://pcsupport.about.com/od/toolsofthetrade/tp/tophddiag.htm

http://www.tacktech.com/display.cfm?ttid=287

take the cd drive out and look to see if it has grounding out marks on the back and look inside the bay

"Google is your friend"

Look up for the driver for your sound card.

Try http://h10025.www1.hp.com/ewfrf/wc/softwareList?os=228&lc=en&dlc=en&cc=us&product=1817074

Before downloading, Search for your HP Pavillion DV2000 so its compatable.

There is a known problem with the video card in this machine, certain models are covered by an extended HP warranty.  Symptoms are overheating and finally not starting at all.

See this link http://h10025.www1.hp.com/ewfrf/wc/document?docname=c01087277&lc=en&cc=us

check yo RAM,Or VGA