Question about HP Compaq Presario C500t Notebook

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Power-on password I cant get to windows because I forgot my power on password and now it wont even let me go into f10.

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Computers that have been setup with a power on password are virtually impossible to guess if you have forgotten the password.
Password protection is setup to prevent people accessing the computer without authorisation. There are no backdoor passwords you can use to get in.

Password protection is usually set up on two levels, first on boot up and second it may also include a password on the hard drive. This is to prevent the hard drive being taken out of a computer and inserting into another (it won't work in another computer).

If the password is saved in the BIOS then it is possible to remove the password by removing the BIOS battery for 1/2 + hour, then reinsert the battery and configure the BIOS again with the date. time, etc. and allow to to boot up into Windows.
Laptops such as IBM Thinkpads, Compaqs use a EEPROM chip to store these passwords and removing the BIOS battery won't work. If you are skilled electronically, you can build a piece of hardware and with a program read the contents of the EEPROM to identify the password, then use this password to get into the computer and then if you can remove the power up password and/or hard disk password or change them.
For information on password hacks go to www.allservice.ro/forum

Posted on Dec 18, 2008

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Remove cover for ram underneath and you will see the wireless module. Remove the two screws for this and you will find the cmos battery under this. You will only have to remove 3 screw in total and the wireless module. Replace battery after a minute and power on password will be gone.

Posted on Jan 03, 2009

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Posted on Jan 02, 2017

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