Hi,
Zac67 gave a good resume of what to check first.
But tell us if you did the PCMCIA reset trick on the motherboard ?
Did you check the other phone component on your line ? did you change the ADSL filter (I had 2 deficients)? have you check them ? Did you have an old condensator at the end of phone line (only if you have multiple wall phone plug) ?
Did you make circle with your ethernet cable ? In this case, making circle change its properties as a torric transformer/antenna that get all electrical waves. Look if you have around your house or flat :
- a military base/police/TV/train station or line
- an old or not so well grounded equipement (such as a microwave, " frigidaire ", washing machine, ...)
All of these can create sudden electrical peak that can destroy your material.
I have a speedtouch 530 that i plugged on my 1200 (rev1.A) with a pcmcia 3C589 and after with a RTL8029AS on the GREX bux, and i had no soucy...