Are you connecting to 2.4GHz or 5GHz band? How about signal strength and link speed of wireless network connection? Did you try on different wireless clients? Firmware of your C7 is up to date?

What's the firmware version of your WR1043ND? Is it up to date? http://www.tp-link.com/en/download/TL-WR1043ND_V1.html#Firmware

Try the guide here. http://www.tp-link.com/en/faq-818.html

Go ahead to repalce it under warranty.

If DSL light is always off, we cannot configure it successfully as it is not synchronized with your line. Did you contact your ISP to check the line and test the line by a different modem? Try to...

tash2z wrote Hardware version V2Firmware version 3.15.9 If so, you should follow FAQ824. Click the link in johnson's post.