...sort, while RAM & Processor is ok, as I've check it by conne i have a PC with 1.7Ghz celeron,845 mother board, 128 ddr ram, its motherboard become sort, while RAM & Processor is ok, as I've check it by connecting on other system, now i changed motherboard with 865, and also SMPS, now as i am installing windows xp or 2000, its becoming restart again & again during setup, sometime before coping setup file and sometime after coping setup files, at least it install with windows xp, but its again restarting again during doing any work. so plz tell me that which part is creating problem as i'have also changed the RAM(128mb 333Mhz) and Hard Disk., is problem with processor or motherboard synchronisation that should be 845 inplace of 865 as it was earlier. or ram FSB(333Mhz) Problem