OK i am totally confused an annoyed. Here is the situation. I have a computer bout year or so old. It is a pentium 4 2.24 ghz 128 mb ram, onboard video and sound. One day i go to turn it on and nothing happens. Monitor is on, speakers are on and printer is on. Pc has no power going to the same power strip. I moved it to the wall outlet still nothing. If i press the power button i will see the lights flash and the processor fan spin for a half turn then nothing. If i keep pressing the power button nothing happens. I put that power supply on another pc and it powered right up. i put a known good and working power supply to this pc and same thing nothing happens. I swapped out the power switch and nothing happens. I figured ok maybe it is the motherboard. i bought a new motherboard and put it together and plugged in everything, double checked all the wires and tried to power it up. same thing half a turn of the fan, lights flash then nothing. i had nothing plugged in except a connector to the motherboard and 1 to the hard drive. then i removed that one and only left the one to the board to see if the fans will power up..NOTHING. there is no memory stick installed because i have to get the right type for this new board but that shouldn't stop it from powering up. Then i was looking around and found an article that said to make sure the power supply is on the right voltage. the power supply has 115 and 230. it was on the 115 so i switched it and turned it on and bam power came on fan was spinning i thought damn what a waste of time but then i saw smoke and smelled something so i QUICKLY pulled out the power cord. nothing was hot except one wire going to the cd-rom spdif. I checked everything and everything was cool to the touch, no marks on the motherboard, no damage i can see, cpu and fan housing was still perfectly cold. So now i don't know what else to do. WHAT WOULD BE CASUING THIS NOT TO POWER UP AT ALL? anyone that can help i would be so appreciative. this is driving me nuts.