Basic set up. Main PC in bedroom, connected to STB via wireless router. Wireless enabled laptop.
I have had a dial up account with Zen for eight years or more, keep it as backup.
Even though I rarely use that account, my main PC has a spares ordering program installed that compiles an order which it then sends to one of my spares suppliers via fax through the PC modem. This has never failed. I can also connect to Zen Internet with no problems on the main PC. The main phone in socket (Ntl) is in the lounge and the cable from my PC terminates in a double socket which is plugged into the Ntl wall socket. Into this is plugged a normal telephone. On rare occasions, the last time about a month ago, I used my laptop, plugged into the other half of the socket and was able to log onto Zen Internet without any problems.
Normally I would just use the wireless connection but in the past week or so we have had three power cuts, each one several hours in duration.
I tried to use my laptop with the dialup connection and I get a 'Telephone signal not detected' error message. The phone plugged into the other socket is live with a dial tone, however as soon as I plug the cable from the laptop into the socket I can hear the receiver click and if I pick it up the line is dead. This happens even when the laptop is switched off. Now I am not sure if this should happen

, its just that I have never noticed it before. I have tried a different cable to no avail.
Laptop modem is a Motorola SM56, I checked on Advanced Properties and noticed that it was set to USA and not the UK in Country/Region, changing this made no difference. Now I'm stuck.
Jim.