Couldn't very well go ask him to reset it, but now it's all goods! Island-wide blackout and all and the bus ticket machine almost ate my last 2€ since it happened as I was about to put it in, but worth the trade off
A better way would have been too access how router's settings and rebooting it from there. Most people don't bother changing the settings password, so getting in is a piece of cake
You can't reset 99% of modems through settings, you need the power button itself or to cut the power... Also, here the password for the settings is tied to the ISP account, so I don't know it, it's randomly generated and only the ISP and the owner knows it. To change settings, you need that username and password, different from wifi's password, so yeah...
Well, here routers come with new connections and login details are preset even if you can change them. Doubt an 80 year old grandpa knows how to change them though so all that was left was to hope for power to go out and voila!
Modems usually don't have a web UI, they just pass the public IP directly to the router. Every router or router+modem I've seen has had a way to reboot from the web UI though. They have to, since rebooting is needed after changing many settings. I don't know if rebooting the router would have been enough though.
I usually reboot both whenever I have internet problems just In case, so I have no idea which one is the culprit, but the modem just converts the PPPoE or whatever connection to a LAN connection the router can recognize, the router does most of the work.
I know, but for DNS issues you have to hard-reset, not soft-reset. Soft resetting fixes a lot of things IF available (routers here don't support that though since they often are older even if they use web UI), while hard resetting makes it so all data packets are dropped and new ones are requested, fixing DNS (or similar) issues. It's similar to pressing power for 10 seconds (I assume you know that trick).
I think that depends on the router, some probably work the exact same way when doing a soft reset.
At least I know that doing a soft reset causes all connections on my PC to be dropped.