Help please! TP-Link Wireless Router TL-WR641G stopped working

It looks like all your devices by themselves are working fine.
Good start.
If you took the router out of your office I assume that the settings from the office and your home are different, which causes the setup not to work properly.

First of all you should find out which hardware version of the router you have and download the manual from here, so you have the information at hand when you're not online.

Then you want to rest the router to factory settings, so you start clean. In order to do so, use the Factory Default Reset button: First, turn off the router's power. Second, press and hold the default reset button then turn on the router's power, until the SYS LED lights up (about 3 seconds). Last, release the reset button and wait for the router to reboot.

Follow the instructions in the manual form page 8 on onwards with a special view on setting up PPPoE. Have your information form your DSL provider handy (Account name and password).
The default webpage for the router interface is http://192.168.1.1
Username and password are both "admin".

Do not enable any wireless security until everything is working fine.

Make sure later to change the password to something else, so no one can "take over" your router.

If this solution did not help, please don't rate it as "Thanks for trying" or so, but leave a comment instead and I will check back and we can work form there.

Good luck!

configuration