So my 9 year old 235w mercury smps goes dead. The hardware dealer says putting a 450w smps might burn the motherboard and components. I could not find less than 450w smps anywhere. So, i buy a second hand Kobian 235w, this worked for the first time. during the next boot started making loud noise...i remembered the seller had told me no return. So i go and buy another used smps, this time a mercury 250w. Now, whenever i play a mp4 movie, it hangs after sometime. plays avi files fine. I have a p3 cpu, 2hdd's, 1dvd-rw, 1cd-rw, geforce4mx, tvtuner, 56k modem, floppy drive My original smps output was: 3.3v-10a, 5v-19a, 12v-8a The 2nd hand mercury smps output: 3.3v-16a, 5v-25a, 12v-9a. Eventhough all the values are greater, it hangs. So, my question is can i use the latest smps in the market for my system without any problem? and what's wrong with the 2nd hand mercury smps?