This just started about 2 weeks ago. When I push in the start button to turn on the computer, It runs for about a second or two, then shuts off. No blue screens, no nothing. Shuts off before the monitor can come on. If you try for a few times, holding it in for a second or two, sometimes it will work right away and sometimes it takes 3 to 4 tries. No virus or trojan, ran everything under the sun for checks, Nothing shows in device manager as a problem. I have windows XP home and a HP computer. I get lights in the front of the computer as usual but they go off as soon as it shuts off. Added nothing new as far as programs go, but windows updates and norton updates are installed in the past 2 weeks. Am not a computer wizard, know enough to get a few things done. Checked HJT and its the same as two months ago. Nothing new. It clicks on as normal, then you hear it click off before it even does much of anything. Puzzled because the warranty was up about a week ago, would of cost 350 to get it renewed for two years and didn't have enough to get it covered. go figure. Anyway, any help would be appreciated. Once it is on, everything works fine.