i have just bought the abit fatal1ty aa8xe. its housing a pentium 4 skt 775 prescott 3.0ghz 512mb ddr2 400mhz ram and a 7800gt at the moment.the problem with it is when u switch it on it boots into windows but in failsafe mode and is making a constant siren noise but isnt coming up with errors!!!.also if u turn it on it will randomly turn it self of but this isnt any thing to do with the power supply as i have tried 2 . if any 1 knows of any help i would b very grateful thanks