Question about Dell Latitude C640 Notebook

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I forgot the log in password for my Windows Vista laptop

I changed my password. Then I went out for a week and can not remember it now. I have tried safe modeand tried to reboot with the operating disk all I got was a black scrren no instructions or anything else, just a white blinking cursor in top left hand corner. I also never set a question for it when I changed the password.

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  • Melissa Williams Nov 16, 2008

    I switched my bios menu so that my cd rom loaded firs,t then tried tried to reinstall vista, and all I got was a black screen with a white cursor box in the left hand corner of the screen.

  • Melissa Williams Nov 16, 2008

    Sorry about the rating I gave. I didn't realize I posted about the wron laptop.

  • Melissa Williams Nov 16, 2008

    MT3422 RTL PC Notebook

    this is actually the laptop i have. i put it in the wrong spot. i have one posted under the right one now

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2 Answers

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  • Dell Master
  • 32,281 Answers

What is the make and model of your computer and the size of the hard disk and RAM?
When you power up your computer, does your computer go through a POST (power on self test), do you get any error messages?
Do you know if the RAM and hard disk are OK?
What happen or what were you doing prior to your computer failing?
Have you got any virus and firewall protection, if so were they enabled?

Suggest you reseat your RAM and hard drive to make sure they are properly connected (they may have lost their electrical connection or the contacts have developed slight corresion) before you try installing Vista again.
Check the BIOS settings for the hard drive, set it to auto (detect), some laptops not only detects attached devices but also require the hard drive, CD/DVD devices etc to be enabled.
Some laptops such as Dell, IBM, Compaq/HP do not need the BIOS setting to be changed to boot up with the CD/DVD first, just press F12 and then select a tempory boot device.

Posted on Nov 16, 2008

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  • Dell Master
  • 32,281 Answers

Try logging in as administrator and don't entry a password just press Enter.
This only works if by luck that the password was not set when Vista was first installed, and was not added later.
There are hack programs in the WEB that can disable Passwords, failing that you will, need to re-install Vista, all drivers and programs again.
You have now learned a lesson the hard way.
Good luck

Posted on Nov 16, 2008

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Posted on Jan 02, 2017

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