Some logical deduction?
When the techie linked his/her notebook via your modem it worked.
Your modem works at your buddy's place and at your work.
When connected to your PC, no modem works.
Ergo - the problem is not your modem but either your PC or the cable linking them.
Is your PC's network card or USB port OK? (depending on which connection you are using.)
Did you bother reading the thread?
The OP posted:
Yes , the ADSL light just flashes and the status in the router config pages says "xDSL not syncronized."
How would his PC or the cable linking it be the problem, please explain???