HP 8510W mobile workstation power on problem

Try F1.

Open Device Manager and revert to the earlier drivers, or just delete the device. Restart the computer and try other drivers if you're not happy with the current drivers. Don't get updated drivers from Windows Update, always download from nVidia or whatever graphics card you have. HP should have drivers intended specifically for your notebook, which takes their setup into account..

how can i unlock the power on password of my mahcine ?

Change your cmos battery?

You can download the DVD and device drivers from the Compaq/HP WEBsupport/download page. Make sure you select your model laptop and the Windowsdrivers you require and install them. Click on this link to download thedrivers: -
http://welcome.hp.com/country/au/en/cs/support.html

Flashing orange light generally indicates battery low charge could be your battery at fault
the next time you try and power on and it doesnt work, take the battery out (unplug AC) and try to run just on AC power
hope helps, let me know if can help further

Does the AC adapter works fine wth other computer? Does the power light glow at the power cord connection. It can be a motherborad issue for the power port that may be loose. Try changing the angle of the power cord and see if it works.

Regards
Nick

go into the control panel, choose power saving option...Change your settings there to the desired time. Change the profile from performance to "balanced"

Uninstall the keyboard driver and let windows driver manage it,Should work fine.

go through the service manual for this laptop