I believe you need to catch this laptop in the linux mode and try to
remove a file that is causing the reboot problem. This file is the one
that was supposed to be modified by trying the WPA settings.

I would also like to know if you believe that following the directions
on the page for WPA led to this problem; or might you have deviated or
made a mistake that caused this problem. We should remove the workaround
if it is a problem; or add a caution.

Please try this:

1 - boot the laptop and use CTL-ALT-Mesh (3rd key from left on the top
row) to force it into the linux terminal

NOTE: since the laptop continues to reboot, you may have to try this a
few times and try to quickly type the next commands while you are in the
linux mode.

2 - type 'root' and hit return to login

3 - you will probably need to use CTL-ALT-Mesh again; then type 'init 3.
This will stop the rebooting.

Next you need to remove the file that was causing the reboot problem.
Here, I am guessing at what file might have caused this, so I will
recommend that you remove a few files that will reconfigure when you
start up again.

4 - Open a second virtual terminal by pressing CTL-ALT-Friends (4th key
from the left on the top row). Login as root. Type: 'rm
/home/olpc/.sugar/default/nm/networks.cfg'

5 - reboot the computer (type: reboot); and see if it will boot up
properly.

If not, you may have to do steps 1-4 again; and then try

'rm /home/olpc/.sugar/default/owner.*'
'rm /home/olpc/.sugar/default/config'

This will require you to add a name and color for your laptop as you did
the first time you turned it on. It should not delete any user data
beyond these config settings.I believe you need to catch this laptop in the linux mode and try to
remove a file that is causing the reboot problem. This file is the one
that was supposed to be modified by trying the WPA settings.

I would also like to know if you believe that following the directions
on the page for WPA led to this problem; or might you have deviated or
made a mistake that caused this problem. We should remove the workaround
if it is a problem; or add a caution.

Please try this:

1 - boot the laptop and use CTL-ALT-Mesh (3rd key from left on the top
row) to force it into the linux terminal

NOTE: since the laptop continues to reboot, you may have to try this a
few times and try to quickly type the next commands while you are in the
linux mode.

2 - type 'root' and hit return to login

3 - you will probably need to use CTL-ALT-Mesh again; then type 'init 3.
This will stop the rebooting.

Next you need to remove the file that was causing the reboot problem.
Here, I am guessing at what file might have caused this, so I will
recommend that you remove a few files that will reconfigure when you
start up again.

4 - Open a second virtual terminal by pressing CTL-ALT-Friends (4th key
from the left on the top row). Login as root. Type: 'rm
/home/olpc/.sugar/default/nm/networks.cfg'

5 - reboot the computer (type: reboot); and see if it will boot up
properly.

If not, you may have to do steps 1-4 again; and then try

'rm /home/olpc/.sugar/default/owner.*'
'rm /home/olpc/.sugar/default/config'

This will require you to add a name and color for your laptop as you did
the first time you turned it on. It should not delete any user data
beyond these config settings.