I have an ACER computer that when I saw it for the first time, the screen was black and the computer would not shut off via the power button on front (Hold for 15 secs), so I had to pull the plug on PS. The first issue with the computer was when it was shut down then started the next day, only "No Input" on monitor. I opened up case, reset RAM then pushed button and the computer would not even turn on. I replaced with 2 other power supplys but they just get the fans started for 2 secs then it shuts down and wil not even get that far until I leave the tower sit for a few minutes. Every other component is unplugged inside and out except the power cord and the monitor cord. There is no "post" becasue it only starts up for 2 secs or less. Is this a fried motherboard? Runninfg Windows Vista with an AMD Athlon 64 x2.