Can not go to BIOS setting?

[quote]The problem was that it askinng for power on password at start up. The customer did not put any password.[/quote]

If someone else did not enter a password, this is a problem that should be referred to the vendor.

[quote]I clear it by removing CMOS battery and this solved the problem[/quote]

I don't believe this is even possible.

[quote]I think by pressing for F8 add the pasword I don't know why.[/quote]

F8 is a Windows function, so no.

[quote]Hard drive is not reconizing,[/quote]

In BIOS? Because your following text indicates that the HDD must be in use.

[quote]when i power it on it goes to a black screen with HP logo and windows vista product key on the top and F9 boot menu F10 Bios setup and F12 network boot,[/quote]

Either this has been configured to display at boot, or iit is being shown because there is a problem with booting normally.

[quote]but none of the option work[/quote]

There may be more significant hardware problems, or the BIOS does not have the correct date set, or something. Try pressing the key used to enter BIOS repeatedly as soon as the system is powered on.

You may want to check the connections for the HDD, etc., but there may be a hardware failure with the drive controller or something. If the machine is still under warranty, contact HP or the vendor immediately. You probably want to do this even if it is not under warranty.

Of course, the disk will not be available for boot until the password problem is resolved, so it is hard to know if there is any other issue. Did we maybe put a blank password in, or the customer is just not admitting to forgetting the password? Or maybe the computer does not really belong to the customer? (Which is why this is the extent to which we answer any sort of password questions here.)

With something like the Ultimate Boot CD as it sounds as if there is a Hardware Issue.

Though if you did not reset the BIOS after removing the Battery it could just be that the system is hitting an Error of a Incorrect BIOS Setting.

You can download the Ultimate Boot CD free here

http://majorgeeks.com/Ultimate_Boot_CD_d4981.html

After you burn the ISO to a CD test the HDD, RAM and Keyboard at the very least and see what if any errors that you get.

As for entering Safe Mode instead of continually pressing the F8 Key I tell my customers to Press & Hold it down till the internal speaker starts going nuts and that will get them to the Screen to select whatever they want. However as said above even continually pressing the F8 Key shouldn't cause the system to do anything else but enter the Windows Selection Screen unless the Keyboard Interpretor on the M'Board is shot. If that's the case here you'll need a new M'Board and I don't think it's worth the repair if that's the case. ;)

Col

Because some time after 8 or 9 power on and off it will go to the bios there i can see the hard drive is not reconized. Once it worked and I installed vista on it, when I reboot it the second time, it took me back to black screen with F9 f10 and f12 option and none work. and the hard drive light go green for a while at sart up and then go off for ever , even not flashing.

Regards

It sounds to me like you have two problems.
1. The pre-boot enhanced controller firmware is corrupted, causing the computer to think it has a password problem. Turn it OFF, remove ALL power (including the CMOS battery) for at least an hour to get everything discharged. Turn it back on and change the BIOS settings to your preferences, including first boot from CD.
2. The MBR on the hard drive is corrupted. That is why it is recognized some boots and not others.
Turn it back on and put a copy of Vista in the CD drive. Go to the Recovery console, run fixboot and fixmbr.