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It's quite strange though. Actually changing your Voltage Setting on your SMPS can fry it immediately unless otherwise it supports a wide range of voltage.

In future in case of cold boot issues, try unplugging the power cord from the PSU and discharge the power by pressing the power button on the PC. Then you may reconnect the power cord to power it up again. This happens to some badly designed power supplies.

so far my adsl modems, servers, laptops are on 24/365 for 2 years......i dont have any lightning/surge protector on it. my area is lightning prone, but i think apartments are more protected from lightning. i use to work in a company dealing with adsl modems and networking products (manufacturer), from our rma records, even with lightning/surge protector will not help your modem or equipment. there's one company that guarantees their lightning protecter call Cal-Lab. you can google for it.