its the second one ,losing power and restarting. can a modem reely use that much power??? i thot that the modem was the smallest thing power-usage wize in the entire system? i will try replacing the modem (i bout 2 ,1 for the old pc and one for my brand new perfomance pc im building) so hopfley that will be it. if its the power supply im just gunna throw the hole thing out and take the hdd out and put it in my moms pc 4 xtra storage. i just spent 1500$ on my dream pc and im not about to buy a new psu for the 10 yo klunker in the other room. il replace the modem tomorrow ...stay tuned.