I have the same problem with trejo, my internet was not working when i use my TP Link TD8840 modem. Its adsl light was solid green, but when i checked the setup page, it says the PPP is down. When i try to use my other old modem, the internet is working. Now im using my old modem (D-Link DSL-502T) for browsing, but it is only has 1 port instead of 4 ports (TD8840). The settings are absolutely the same for both modems (VPI, VCI, username, password, pppoe, etc). I've tried to change the firmware of my TTD8840 modem several times, but it still not working yet. Could you help me to solve my problem before i decide to buy another 4 ports modem?