When i try to log in to facebook on any computer, all that happens is a white screen. i still have other internet access.

If you can't log in with your mobile number:

• Make sure you enter your entire mobile phone number, including the country code
• Leave out any extra zeros, plus signs (+) or other special characters

If you signed up for Facebook using your mobile phone, you can use your mobile phone number to log in on any device. If you still can't log in or forgot your password, request a new password.
Otherwise Use Your Email Address as Username And Password To Login !! I hope This Helps!!

these might help

Facebook serves to keep individuals in touch
with their friends and family members through interactive Facebook profiles.

If you aren\'t already one of the over 800
million active users of Facebook, you might want to check out the social
network.

It takes only minutes to sign up for a free Facebook
account. Open an Internet browser on your computer and navigate to the Facebook
Sign Up Web page.

Enter your real first and last name, your email address and
a password.


Select your sex and birthday from the pop-up menus.

You must be at least 13 years old to sign up for a Facebook
account.


Click the "Sign Up" button at the bottom of the
screen.

Type the "Captcha" security code into the box
provided.

You are presented with opportunities to find existing
friends on Facebook.


If you give the site permission, it compares your contact
list to the names of people already on Facebook. You can skip this step for
now, if you like.

Enter information for your profile.


Spaces are provided for you to enter you school or college,
hometown, current city, interests and lots of other information.

For now, enter just the basics. You can go back later and
expand on your profile information.

Upload a profile picture when prompted.


This should be an actual photograph of you, which helps
friends find and identify you on the site.

Check your email. Facebook sends a confirmation email to the
email address you listed on the Sign Up page.

Confirm the account as requested.


You have created a Facebook account.


Log in Access My Facebook Account

When Facebook was founded on February 4, 2004, it defined
its mission as "Giving people the power to share and make the world more
open and connected."

With the widespread success of this social networking
website today more than 500 million
regular users as of April 2011 it may meet that goal for many.

When a Facebook user can no longer access an account, it can
be frustrating, but there is typically a reasonable explanation.

Cookies/Cache

Facebook suggests that any user who can\'t access their
account should clear cookies and cache on their computer as a first step.

This will help remove old and unneeded files from your
computer, and will sometimes help your computer to run faster, as well as
allowing access to Facebook again.

Once cookies and cache have been cleared, you should type
"m.facebook.com" into the address bar on your computer.

Avoid using any old bookmarks or links to visit Facebook for
this first visit after clearing the cookies and cache.

Password Incorrect

If you attempt to log into your Facebook account with an
incorrect password, you will be unable to access your account.

Even if you have the correct email address, that is only
half of the log-in equation, and the correct password is absolutely necessary
to log into the site.

If you may have entered the wrong password, enter it again,
taking care to get each character correct.

Passwords are case sensitive, so all capital and lowercase
letters and any symbols must be entered correctly.





If you have forgotten your password, you will need to click
the "Forgot Your Password" link to recover your account and create a
new password.

Account Closed

Facebook reserves the right to close accounts that they have
determined are in violation of their terms of service.

If Facebook found that your account contained inappropriate
content, did not represent a real person, or violated Facebook rules in some
way, the account may be closed, leaving you unable to access it.

If your account was closed for one of these reasons, your
login will fail and you will be provided with a link to Facebook\'s
"Confirm Your Identity" page, where you can read about typical
reasons for account closures.

Email Login Incorrect

If you have entered the incorrect email address, you will be
unable to log into your Facebook account.

The email address that you use to log into Facebook is case
sensitive, just as your email address is. If you fail to capitalize a letter or
forget to insert an underscore that is part of the email address, login will
fail.

If you cannot access your Facebook account due to an
incorrect email address, double checking the address for correctness prior to
logging in again will resolve the issue.

Compromised Account

If account information such as your email address or
password is stolen, your account may be compromised.

If, for example, your account information is stolen, the
person in possession of your log-in information can access your account and
change the password so that you will no longer be able to get to your account.

If you think this may have happened, you must access the
"Compromised Account" page on Facebook and follow steps to prove your
identity and secure your account.




http://www.facebook.com/help/?faq=18110&ref_query=can%27t+access+

You will first need to log out of the other person's account. Just click the small gear icon in the top right and click log out. Once you log out you can then enter your email and password to log in.

Just don't forget to log out of your account once your finished or others will be able to access your account on that computer.

Hope that helps!

Facebook is a well-recognized social networking website that offers intuitive methods to communicate and interact with friends and family.
Online video games, Instant messaging and community message boards are only a few of the interactive features Facebook provides.
You can log into your account with any computer that has an active Internet connection.
Launch your default Web browser, such as Internet Explorer, from the computer's Start menu. You may also type the name of the browser into the "Start" menu search box, and then press "Enter" to launch it.
Visit Facebook.com to access your account.
If someone else's account is already logged in, click the "Account" option from the upper portion of the page and select "Log Out."


Enter your email address and your current password into their respective fields.

Click "Login" to access your Facebook account.


http://www.facebook.com/help/?tab=browse
Facebook Help Topics

Clear your browser's internet history and cache

Did you guys try clearing your cache and cookies? To do so, go to the Wrench -> Options -> Under The Hood. Under the Privacy section, click on the Clear browsing data button. Select to clear the cache and cookies options (note you will be logged out of any sites you're logged into). Towards the bottom, select to clear this data from the past week, then click Clear browsing data.
If you're still having layout issues after doing this, does it work if you try logging into Facebook using incognito mode? Click Control + Shift + N to open an incognito window.
If the two above suggestions don't solve it, please provide your Google Chrome version (go to Wrench menu -> About Google Chrome) and tell us what operating system you're on (e.g. WinXP, Win7, Mac OSX, etc)?

Facebook servers were under maintenance

You have have to restart your computer and check your internet settings. Can you log onto any other website?