Confirm that you are logging in with a valid Contra Costa County Library card, using the full card number with no spaces. Enter this number in the top box, and your last name in the bottom box.
If you are still experiencing problems logging in, try clearing the cache on your browser, and don't use any old shortcuts, old book marks, or autofill. Here is an article from PC Magazine on how to clear the cache in various browsers: https://www.pcmag.com/article2/0,2817,2480401,00.asp. In addition, you can also try rebooting your device.
If these actions do not resolve the issue for you, please fill out and submit the following form, along with any error messages you see or screen shots that will help indicate the type of error you are experiencing: http://ccclib.org/askaquestion/webpageerrorform.html.
You can also access your account information and renew items 24/7 at: 800-984-4636, or receive assistance via phone or in person at any branch during open hours: http://ccclib.org/locations/index.html.
If you can’t access your account because the card has expired, click here: http://ccclib.ask.libraryh3lp.com/questions/20927