4100SS Power Button fails

most companies give a warranty or modem replacement if it's within a year old. contact your ISP & check if they can replace it or give you a new discounted one. also, try using newer or latest modem versions.

I also had this problem with the 4100. This is what I did as a "Lo-Tech" fix. If you push in your power button and hold it in, and your modem powers on, then this should work for you. First unplug all cords. Turn the modem over and remove the small phillips screw from the bottom. Next, gently pry apart the two halves of the case. There are 4 tabs total. I found working back to front the best way. After removing the top half, gently pull the circuit board up and out. Now for the magic. Get yourself a twist-tie. Push the button all the way in, and wrap the twist tie around the whole button. Twist it down tight, and put everything back together. You should be good to go. If this doesn't work for you, or holding in the power button doesn't power up your modem, you could try just blobbing some solder over the three pins on the bottom of the board, under the switch. This should bypass the switch completely. Either way, you can cycle your power on and off with the cord instead of the button. Hope this helps!