I got the message "4403D" when I tried to startup while pressing "Option D" keys while starting up. What does this mean?

I have a Macbook purchased in 2009. I am running Mavericks, which has caused several programs to stop opening (Calendar, Quicktime...) so I have been trying several things to fix it. One thing is to try to do a Apple Hardware Test over the internet. In order to do this I need to restart my computer while pressing the option and D keys.
When I did so I got the message "4403D". I had to hold the power button down to turn off the computer in order to restart normally so I can use it.
What does this mean? And how do I fix the programs?

Can you provide the link of the website on which you are having problems ??
Perform the suggestions mentioned in the following articles:
* [https://support.mozilla.com/en-US/kb/Template:clearCookiesCache/ Clear Cookies & Cache]
* [[Troubleshooting extensions and themes]]
Check and tell if its working.
-> Update All your Firefox Plugins -> [https://www.mozilla.org/en-US/plugincheck/]
* '''When Downloading Plugins Update setup files, Remove Checkmark from Downloading other Optional Softwares with your Plugins (e.g. Toolbars, McAfee, Google Chrome, etc.)'''

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I got the message "4403D" when I tried to startup while pressing "Option D" keys while starting up. What does this mean?

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